---
_id: '42033'
author:
- first_name: A
full_name: Rastelli, A
last_name: Rastelli
- first_name: F
full_name: Ding, F
last_name: Ding
- first_name: J.D
full_name: Plumhof, J.D
last_name: Plumhof
- first_name: S
full_name: Kumar, S
last_name: Kumar
- first_name: R
full_name: Trotta, R
last_name: Trotta
- first_name: C
full_name: Deneke, C
last_name: Deneke
- first_name: A
full_name: ' Malachias, A'
last_name: ' Malachias'
- first_name: P
full_name: Atkinson, P
last_name: Atkinson
- first_name: E
full_name: Zallo, E
last_name: Zallo
- first_name: T
full_name: Zander, T
last_name: Zander
- first_name: A
full_name: Herklotz, A
last_name: Herklotz
- first_name: R
full_name: ' Singh, R'
last_name: ' Singh'
- first_name: V
full_name: Krápek, V
last_name: Krápek
- first_name: J.R
full_name: Schrötel, J.R
last_name: Schrötel
- first_name: S
full_name: ' Kiravittaya, S'
last_name: ' Kiravittaya'
- first_name: M
full_name: Benyoucef,, M
last_name: Benyoucef,
- first_name: R
full_name: Hafenbrak, R
last_name: Hafenbrak
- first_name: Klaus D.
full_name: Jöns, Klaus D.
id: '85353'
last_name: Jöns
- first_name: D.J
full_name: Thurmer, D.J
last_name: Thurmer
- first_name: D
full_name: Grimm, D
last_name: Grimm
- first_name: G
full_name: ' Bester, G'
last_name: ' Bester'
- first_name: K
full_name: Dörr, K
last_name: Dörr
- first_name: P
full_name: Michler, P
last_name: Michler
- first_name: O.G
full_name: Schmidt, O.G
last_name: Schmidt
citation:
ama: Rastelli A, Ding F, Plumhof JD, et al. Controlling quantum dot emission by
integration of semiconductor nanomembranes onto piezoelectric actuators. 2012;249(4):687-696.
apa: Rastelli, A., Ding, F., Plumhof, J. D., Kumar, S., Trotta, R., Deneke, C., Malachias,
A., Atkinson, P., Zallo, E., Zander, T., Herklotz, A., Singh, R., Krápek, V.,
Schrötel, J. R., Kiravittaya, S., Benyoucef, M., Hafenbrak, R., Jöns, K. D.,
Thurmer, D. J., … Schmidt, O. G. (2012). Controlling quantum dot emission by
integration of semiconductor nanomembranes onto piezoelectric actuators (Vol.
249, Issue 4, pp. 687–696).
bibtex: '@article{Rastelli_Ding_Plumhof_Kumar_Trotta_Deneke_ Malachias_Atkinson_Zallo_Zander_et
al._2012, series={Phys. Status Solidi B }, title={Controlling quantum dot emission
by integration of semiconductor nanomembranes onto piezoelectric actuators}, volume={249},
number={4}, author={Rastelli, A and Ding, F and Plumhof, J.D and Kumar, S and
Trotta, R and Deneke, C and Malachias, A and Atkinson, P and Zallo, E and Zander,
T and et al.}, year={2012}, pages={687–696}, collection={Phys. Status Solidi B
} }'
chicago: Rastelli, A, F Ding, J.D Plumhof, S Kumar, R Trotta, C Deneke, A Malachias,
et al. “Controlling Quantum Dot Emission by Integration of Semiconductor Nanomembranes
onto Piezoelectric Actuators.” Phys. Status Solidi B , 2012.
ieee: A. Rastelli et al., “Controlling quantum dot emission by integration
of semiconductor nanomembranes onto piezoelectric actuators,” vol. 249, no. 4.
pp. 687–696, 2012.
mla: Rastelli, A., et al. Controlling Quantum Dot Emission by Integration of
Semiconductor Nanomembranes onto Piezoelectric Actuators. no. 4, 2012, pp.
687–96.
short: A. Rastelli, F. Ding, J.D. Plumhof, S. Kumar, R. Trotta, C. Deneke, A. Malachias,
P. Atkinson, E. Zallo, T. Zander, A. Herklotz, R. Singh, V. Krápek, J.R. Schrötel,
S. Kiravittaya, M. Benyoucef, R. Hafenbrak, K.D. Jöns, D.J. Thurmer, D. Grimm,
G. Bester, K. Dörr, P. Michler, O.G. Schmidt, 249 (2012) 687–696.
date_created: 2023-02-13T08:44:08Z
date_updated: 2023-02-13T08:44:28Z
department:
- _id: '623'
intvolume: ' 249'
issue: '4'
language:
- iso: eng
page: 687-696
series_title: 'Phys. Status Solidi B '
status: public
title: Controlling quantum dot emission by integration of semiconductor nanomembranes
onto piezoelectric actuators
type: conference
user_id: '71124'
volume: 249
year: '2012'
...
---
_id: '42028'
article_number: '063526'
author:
- first_name: C
full_name: Hermannstädter, C
last_name: Hermannstädter
- first_name: M
full_name: ' Witzany, M'
last_name: ' Witzany'
- first_name: M
full_name: Heldmaier, M
last_name: Heldmaier
- first_name: R
full_name: Hafenbrak, R
last_name: Hafenbrak
- first_name: Klaus D.
full_name: Jöns, Klaus D.
id: '85353'
last_name: Jöns
- first_name: G.J
full_name: Beirne, G.J
last_name: Beirne
- first_name: P
full_name: Michler, P
last_name: Michler
citation:
ama: Hermannstädter C, Witzany M, Heldmaier M, et al. Polarization anisotropic
luminescence of tunable single lateral quantum dot molecules. 2012;111.
apa: Hermannstädter, C., Witzany, M., Heldmaier, M., Hafenbrak, R., Jöns, K. D.,
Beirne, G. J., & Michler, P. (2012). Polarization anisotropic luminescence
of tunable single lateral quantum dot molecules (No. 063526; Vol. 111).
bibtex: '@article{Hermannstädter_ Witzany_Heldmaier_Hafenbrak_Jöns_Beirne_Michler_2012,
series={Journal of Applied Physics }, title={Polarization anisotropic luminescence
of tunable single lateral quantum dot molecules}, volume={111}, number={063526},
author={Hermannstädter, C and Witzany, M and Heldmaier, M and Hafenbrak, R and
Jöns, Klaus D. and Beirne, G.J and Michler, P}, year={2012}, collection={Journal
of Applied Physics } }'
chicago: Hermannstädter, C, M Witzany, M Heldmaier, R Hafenbrak, Klaus D. Jöns,
G.J Beirne, and P Michler. “Polarization anisotropic luminescence of tunable single
lateral quantum dot molecules.” Journal of Applied Physics , 2012.
ieee: C. Hermannstädter et al., “Polarization anisotropic luminescence of
tunable single lateral quantum dot molecules,” vol. 111. 2012.
mla: Hermannstädter, C., et al. Polarization anisotropic luminescence of tunable
single lateral quantum dot molecules. 063526, 2012.
short: C. Hermannstädter, M. Witzany, M. Heldmaier, R. Hafenbrak, K.D. Jöns, G.J.
Beirne, P. Michler, 111 (2012).
date_created: 2023-02-13T08:06:58Z
date_updated: 2023-02-13T08:45:12Z
department:
- _id: '623'
intvolume: ' 111'
language:
- iso: ger
publication_status: published
series_title: 'Journal of Applied Physics '
status: public
title: Polarization anisotropic luminescence of tunable single lateral quantum dot
molecules
type: conference
user_id: '71124'
volume: 111
year: '2012'
...
---
_id: '42029'
author:
- first_name: Klaus D.
full_name: Jöns, Klaus D.
id: '85353'
last_name: Jöns
- first_name: R
full_name: Hafenbrak, R
last_name: Hafenbrak
- first_name: P
full_name: Atkinson, P
last_name: Atkinson
- first_name: A
full_name: Rastelli, A
last_name: Rastelli
- first_name: O.G
full_name: Schmidt, O.G
last_name: Schmidt
- first_name: P
full_name: Michler, P
last_name: Michler
citation:
ama: Jöns KD, Hafenbrak R, Atkinson P, Rastelli A, Schmidt OG, Michler P. Quantum
state tomography measurements on strain-tuned In(x)Ga(1−x)As/GaAs quantum dots.
2012;249(4):697-701.
apa: Jöns, K. D., Hafenbrak, R., Atkinson, P., Rastelli, A., Schmidt, O. G., &
Michler, P. (2012). Quantum state tomography measurements on strain-tuned In(x)Ga(1−x)As/GaAs
quantum dots (Vol. 249, Issue 4, pp. 697–701).
bibtex: '@article{Jöns_Hafenbrak_Atkinson_Rastelli_Schmidt_Michler_2012, series={Phys.
Status Solidi B }, title={Quantum state tomography measurements on strain-tuned
In(x)Ga(1−x)As/GaAs quantum dots}, volume={249}, number={4}, author={Jöns, Klaus
D. and Hafenbrak, R and Atkinson, P and Rastelli, A and Schmidt, O.G and Michler,
P}, year={2012}, pages={697–701}, collection={Phys. Status Solidi B } }'
chicago: Jöns, Klaus D., R Hafenbrak, P Atkinson, A Rastelli, O.G Schmidt, and P
Michler. “Quantum State Tomography Measurements on Strain-Tuned In(x)Ga(1−x)As/GaAs
Quantum Dots.” Phys. Status Solidi B , 2012.
ieee: K. D. Jöns, R. Hafenbrak, P. Atkinson, A. Rastelli, O. G. Schmidt, and P.
Michler, “Quantum state tomography measurements on strain-tuned In(x)Ga(1−x)As/GaAs
quantum dots,” vol. 249, no. 4. pp. 697–701, 2012.
mla: Jöns, Klaus D., et al. Quantum State Tomography Measurements on Strain-Tuned
In(x)Ga(1−x)As/GaAs Quantum Dots. no. 4, 2012, pp. 697–701.
short: K.D. Jöns, R. Hafenbrak, P. Atkinson, A. Rastelli, O.G. Schmidt, P. Michler,
249 (2012) 697–701.
date_created: 2023-02-13T08:13:12Z
date_updated: 2023-02-13T08:44:41Z
department:
- _id: '623'
intvolume: ' 249'
issue: '4'
language:
- iso: eng
page: 697-701
series_title: 'Phys. Status Solidi B '
status: public
title: Quantum state tomography measurements on strain-tuned In(x)Ga(1−x)As/GaAs quantum
dots
type: conference
user_id: '71124'
volume: 249
year: '2012'
...
---
_id: '8169'
abstract:
- lang: eng
text: The polynomial hierarchy plays a central role in classical complexity theory.
Here, we define a quantum generalization of the polynomial hierarchy, and initiate
its study. We show that not only are there natural complete problems for the second
level of this quantum hierarchy, but that these problems are in fact hard to approximate.
Our work thus yields the first known hardness of approximation results for a quantum
complexity class. Using these techniques, we also obtain hardness of approximation
for the class QCMA. Our approach is based on the use of dispersers, and is inspired
by the classical results of Umans regarding hardness of approximation for the
second level of the classical polynomial hierarchy (Umans 1999). We close by showing
that a variant of the local Hamiltonian problem with hybrid classical-quantum
ground states is complete for the second level of our quantum hierarchy.
author:
- first_name: Sevag
full_name: Gharibian, Sevag
id: '71541'
last_name: Gharibian
orcid: 0000-0002-9992-3379
- first_name: Julia
full_name: Kempe, Julia
last_name: Kempe
citation:
ama: 'Gharibian S, Kempe J. Hardness of Approximation for Quantum Problems. In:
Czumaj A, Mehlhorn K, Pitts A, Wattenhofer R, eds. International Colloquium
on Automata, Languages, and Programming (ICALP 2012). Springer Berlin Heidelberg;
2012:387-398. doi:10.1007/978-3-642-31594-7_33'
apa: Gharibian, S., & Kempe, J. (2012). Hardness of Approximation for Quantum
Problems. In A. Czumaj, K. Mehlhorn, A. Pitts, & R. Wattenhofer (Eds.), International
Colloquium on Automata, Languages, and Programming (ICALP 2012) (pp. 387–398).
Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-642-31594-7_33
bibtex: '@inproceedings{Gharibian_Kempe_2012, place={Berlin, Heidelberg}, title={Hardness
of Approximation for Quantum Problems}, DOI={10.1007/978-3-642-31594-7_33},
booktitle={International Colloquium on Automata, Languages, and Programming (ICALP
2012)}, publisher={Springer Berlin Heidelberg}, author={Gharibian, Sevag and Kempe,
Julia}, editor={Czumaj, Artur and Mehlhorn, Kurt and Pitts, Andrew and Wattenhofer,
Roger}, year={2012}, pages={387–398} }'
chicago: 'Gharibian, Sevag, and Julia Kempe. “Hardness of Approximation for Quantum
Problems.” In International Colloquium on Automata, Languages, and Programming
(ICALP 2012), edited by Artur Czumaj, Kurt Mehlhorn, Andrew Pitts, and Roger
Wattenhofer, 387–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. https://doi.org/10.1007/978-3-642-31594-7_33.'
ieee: 'S. Gharibian and J. Kempe, “Hardness of Approximation for Quantum Problems,”
in International Colloquium on Automata, Languages, and Programming (ICALP
2012), Warwick, UK, 2012, pp. 387–398, doi: 10.1007/978-3-642-31594-7_33.'
mla: Gharibian, Sevag, and Julia Kempe. “Hardness of Approximation for Quantum Problems.”
International Colloquium on Automata, Languages, and Programming (ICALP 2012),
edited by Artur Czumaj et al., Springer Berlin Heidelberg, 2012, pp. 387–98, doi:10.1007/978-3-642-31594-7_33.
short: 'S. Gharibian, J. Kempe, in: A. Czumaj, K. Mehlhorn, A. Pitts, R. Wattenhofer
(Eds.), International Colloquium on Automata, Languages, and Programming (ICALP
2012), Springer Berlin Heidelberg, Berlin, Heidelberg, 2012, pp. 387–398.'
conference:
location: Warwick, UK
name: International Colloquium on Automata, Languages, and Programming (ICALP)
date_created: 2019-03-01T11:55:18Z
date_updated: 2023-02-28T11:03:26Z
department:
- _id: '623'
- _id: '7'
doi: 10.1007/978-3-642-31594-7_33
editor:
- first_name: Artur
full_name: Czumaj, Artur
last_name: Czumaj
- first_name: Kurt
full_name: Mehlhorn, Kurt
last_name: Mehlhorn
- first_name: Andrew
full_name: Pitts, Andrew
last_name: Pitts
- first_name: Roger
full_name: Wattenhofer, Roger
last_name: Wattenhofer
extern: '1'
external_id:
arxiv:
- '1209.1055'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1209.1055
oa: '1'
page: 387-398
place: Berlin, Heidelberg
publication: International Colloquium on Automata, Languages, and Programming (ICALP
2012)
publication_identifier:
isbn:
- 978-3-642-31594-7
publication_status: published
publisher: Springer Berlin Heidelberg
status: public
title: Hardness of Approximation for Quantum Problems
type: conference
user_id: '71541'
year: '2012'
...
---
_id: '8175'
abstract:
- lang: eng
text: Approximation algorithms for classical constraint satisfaction problems are
one of the main research areas in theoretical computer science. Here we define
a natural approximation version of the QMA-complete local Hamiltonian problem
(where QMA stands for Quantum Merlin Arthur) and initiate its study. We present
two main results. The first shows that a nontrivial approximation ratio can be
obtained in the class NP using product states. The second result (which builds
on the first one) gives a polynomial time (classical) algorithm providing a similar
approximation ratio for dense instances of the problem. The latter result is based
on an adaptation of the “exhaustive sampling method” by Arora, Karger, and Karpinski
[J. Comput. System Sci., 58 (1999), p. 193] to the quantum setting and might be
of independent interest.
article_type: original
author:
- first_name: Sevag
full_name: Gharibian, Sevag
id: '71541'
last_name: Gharibian
orcid: 0000-0002-9992-3379
- first_name: Julia
full_name: Kempe, Julia
last_name: Kempe
citation:
ama: Gharibian S, Kempe J. Approximation Algorithms for QMA-Complete Problems. SIAM
Journal on Computing. 2012;41(4):1028-1050. doi:10.1137/110842272
apa: Gharibian, S., & Kempe, J. (2012). Approximation Algorithms for QMA-Complete
Problems. SIAM Journal on Computing, 41(4), 1028–1050. https://doi.org/10.1137/110842272
bibtex: '@article{Gharibian_Kempe_2012, title={Approximation Algorithms for QMA-Complete
Problems}, volume={41}, DOI={10.1137/110842272},
number={4}, journal={SIAM Journal on Computing}, publisher={Society for Industrial
& Applied Mathematics (SIAM)}, author={Gharibian, Sevag and Kempe, Julia},
year={2012}, pages={1028–1050} }'
chicago: 'Gharibian, Sevag, and Julia Kempe. “Approximation Algorithms for QMA-Complete
Problems.” SIAM Journal on Computing 41, no. 4 (2012): 1028–50. https://doi.org/10.1137/110842272.'
ieee: 'S. Gharibian and J. Kempe, “Approximation Algorithms for QMA-Complete Problems,”
SIAM Journal on Computing, vol. 41, no. 4, pp. 1028–1050, 2012, doi: 10.1137/110842272.'
mla: Gharibian, Sevag, and Julia Kempe. “Approximation Algorithms for QMA-Complete
Problems.” SIAM Journal on Computing, vol. 41, no. 4, Society for Industrial
& Applied Mathematics (SIAM), 2012, pp. 1028–50, doi:10.1137/110842272.
short: S. Gharibian, J. Kempe, SIAM Journal on Computing 41 (2012) 1028–1050.
date_created: 2019-03-01T12:04:03Z
date_updated: 2023-02-28T11:03:50Z
department:
- _id: '623'
- _id: '7'
doi: 10.1137/110842272
extern: '1'
external_id:
arxiv:
- '1101.3884'
intvolume: ' 41'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1101.3884
oa: '1'
page: 1028-1050
publication: SIAM Journal on Computing
publication_identifier:
issn:
- 0097-5397
- 1095-7111
publication_status: published
publisher: Society for Industrial & Applied Mathematics (SIAM)
status: public
title: Approximation Algorithms for QMA-Complete Problems
type: journal_article
user_id: '71541'
volume: 41
year: '2012'
...
---
_id: '8174'
abstract:
- lang: eng
text: We propose a measure of non-classical correlations in bipartite quantum states
based on local unitary operations. We prove the measure is non-zero if and only
if the quantum discord is non-zero; this is achieved via a new characterization
of zero discord states in terms of the state's correlation matrix. Moreover, our
scheme can be extended to ensure the same relationship holds even with a generalized
version of quantum discord in which higher-rank projective measurements are allowed.
We next derive a closed form expression for our scheme in the cases of Werner
states and (2 x N)-dimensional systems. The latter reveals that for (2 x N)-dimensional
states, our measure reduces to the geometric discord [Dakic et al., PRL 105, 2010].
A connection to the CHSH inequality is shown. We close with a characterization
of all maximally non-classical, yet separable, (2 x N)-dimensional states of rank
at most two (with respect to our measure).
article_type: original
author:
- first_name: Sevag
full_name: Gharibian, Sevag
id: '71541'
last_name: Gharibian
orcid: 0000-0002-9992-3379
citation:
ama: Gharibian S. Quantifying nonclassicality with local unitary operations. Physical
Review A. 2012;86:042106. doi:10.1103/PhysRevA.86.042106
apa: Gharibian, S. (2012). Quantifying nonclassicality with local unitary operations.
Physical Review A, 86, 042106. https://doi.org/10.1103/PhysRevA.86.042106
bibtex: '@article{Gharibian_2012, title={Quantifying nonclassicality with local
unitary operations}, volume={86}, DOI={10.1103/PhysRevA.86.042106},
journal={Physical Review A}, publisher={American Physical Society}, author={Gharibian,
Sevag}, year={2012}, pages={042106} }'
chicago: 'Gharibian, Sevag. “Quantifying Nonclassicality with Local Unitary Operations.”
Physical Review A 86 (2012): 042106. https://doi.org/10.1103/PhysRevA.86.042106.'
ieee: 'S. Gharibian, “Quantifying nonclassicality with local unitary operations,”
Physical Review A, vol. 86, p. 042106, 2012, doi: 10.1103/PhysRevA.86.042106.'
mla: Gharibian, Sevag. “Quantifying Nonclassicality with Local Unitary Operations.”
Physical Review A, vol. 86, American Physical Society, 2012, p. 042106,
doi:10.1103/PhysRevA.86.042106.
short: S. Gharibian, Physical Review A 86 (2012) 042106.
date_created: 2019-03-01T12:01:41Z
date_updated: 2023-02-28T11:03:38Z
department:
- _id: '623'
- _id: '7'
doi: 10.1103/PhysRevA.86.042106
extern: '1'
external_id:
arxiv:
- '1202.1598'
intvolume: ' 86'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1202.1598
oa: '1'
page: '042106'
publication: Physical Review A
publication_status: published
publisher: American Physical Society
status: public
title: Quantifying nonclassicality with local unitary operations
type: journal_article
user_id: '71541'
volume: 86
year: '2012'
...
---
_id: '42031'
article_number: '121302'
author:
- first_name: J.D
full_name: Plumhof, J.D
last_name: Plumhof
- first_name: V
full_name: ' Krápek, V'
last_name: ' Krápek'
- first_name: F
full_name: Ding, F
last_name: Ding
- first_name: Klaus D.
full_name: Jöns, Klaus D.
id: '85353'
last_name: Jöns
- first_name: R
full_name: Hafenbrak, R
last_name: Hafenbrak
- first_name: P
full_name: ' Klenovský, P'
last_name: ' Klenovský'
- first_name: A
full_name: Herklotz, A
last_name: Herklotz
- first_name: K
full_name: ' Dörr, K'
last_name: ' Dörr'
- first_name: P
full_name: ' Michler , P'
last_name: ' Michler '
- first_name: A
full_name: Rastelli,, A
last_name: Rastelli,
- first_name: O.G
full_name: Schmidt, O.G
last_name: Schmidt
citation:
ama: Plumhof JD, Krápek V, Ding F, et al. Strain-induced anticrossing of bright
exciton levels in single self-assembled GaAs/Al(x)Ga(1−x)As and In(x)Ga(1−x)As/GaAs
quantum dots. 2011;83.
apa: Plumhof, J. D., Krápek, V., Ding, F., Jöns, K. D., Hafenbrak, R., Klenovský,
P., Herklotz, A., Dörr, K., Michler , P., Rastelli, A., & Schmidt, O. G.
(2011). Strain-induced anticrossing of bright exciton levels in single self-assembled
GaAs/Al(x)Ga(1−x)As and In(x)Ga(1−x)As/GaAs quantum dots (No. 121302; Vol.
83).
bibtex: '@article{Plumhof_ Krápek_Ding_Jöns_Hafenbrak_ Klenovský_Herklotz_ Dörr_
Michler _Rastelli,_et al._2011, series={Phys. Rev. B}, title={Strain-induced anticrossing
of bright exciton levels in single self-assembled GaAs/Al(x)Ga(1−x)As and In(x)Ga(1−x)As/GaAs
quantum dots}, volume={83}, number={121302}, author={Plumhof, J.D and Krápek,
V and Ding, F and Jöns, Klaus D. and Hafenbrak, R and Klenovský, P and Herklotz,
A and Dörr, K and Michler , P and Rastelli, A and et al.}, year={2011}, collection={Phys.
Rev. B} }'
chicago: Plumhof, J.D, V Krápek, F Ding, Klaus D. Jöns, R Hafenbrak, P Klenovský,
A Herklotz, et al. “Strain-Induced Anticrossing of Bright Exciton Levels in Single
Self-Assembled GaAs/Al(x)Ga(1−x)As and In(x)Ga(1−x)As/GaAs Quantum Dots.” Phys.
Rev. B, 2011.
ieee: J. D. Plumhof et al., “Strain-induced anticrossing of bright exciton
levels in single self-assembled GaAs/Al(x)Ga(1−x)As and In(x)Ga(1−x)As/GaAs quantum
dots,” vol. 83. 2011.
mla: Plumhof, J. D., et al. Strain-Induced Anticrossing of Bright Exciton Levels
in Single Self-Assembled GaAs/Al(x)Ga(1−x)As and In(x)Ga(1−x)As/GaAs Quantum Dots.
121302, 2011.
short: J.D. Plumhof, V. Krápek, F. Ding, K.D. Jöns, R. Hafenbrak, P. Klenovský,
A. Herklotz, K. Dörr, P. Michler , A. Rastelli,, O.G. Schmidt, 83 (2011).
date_created: 2023-02-13T08:26:54Z
date_updated: 2023-02-13T08:44:35Z
department:
- _id: '623'
intvolume: ' 83'
language:
- iso: eng
series_title: Phys. Rev. B
status: public
title: Strain-induced anticrossing of bright exciton levels in single self-assembled
GaAs/Al(x)Ga(1−x)As and In(x)Ga(1−x)As/GaAs quantum dots
type: conference
user_id: '71124'
volume: 83
year: '2011'
...
---
_id: '42032'
author:
- first_name: Klaus D.
full_name: Jöns, Klaus D.
id: '85353'
last_name: Jöns
- first_name: R
full_name: ' Hafenbrak, R'
last_name: ' Hafenbrak'
- first_name: R
full_name: Singh, R
last_name: Singh
- first_name: F
full_name: Ding, F
last_name: Ding
- first_name: J.D
full_name: ' Plumhof, J.D'
last_name: ' Plumhof'
- first_name: A
full_name: Rastelli, A
last_name: Rastelli
- first_name: O.G
full_name: ' Schmidt, O.G'
last_name: ' Schmidt'
- first_name: G
full_name: Bester, G
last_name: Bester
- first_name: P
full_name: Michler, P
last_name: Michler
citation:
ama: Jöns KD, Hafenbrak R, Singh R, et al. Dependence of the Redshifted and Blueshifted
Photoluminescence Spectra of Single In(x)Ga(1−x)As/GaAs Quantum Dots on the Applied
Uniaxial Stress. 2011;107:217402.
apa: Jöns, K. D., Hafenbrak, R., Singh, R., Ding, F., Plumhof, J. D., Rastelli,
A., Schmidt, O. G., Bester, G., & Michler, P. (2011). Dependence of the
Redshifted and Blueshifted Photoluminescence Spectra of Single In(x)Ga(1−x)As/GaAs
Quantum Dots on the Applied Uniaxial Stress (Vol. 107, p. 217402).
bibtex: '@article{Jöns_ Hafenbrak_Singh_Ding_ Plumhof_Rastelli_ Schmidt_Bester_Michler_2011,
series={Phys. Rev. Lett.}, title={Dependence of the Redshifted and Blueshifted
Photoluminescence Spectra of Single In(x)Ga(1−x)As/GaAs Quantum Dots on the Applied
Uniaxial Stress}, volume={107}, author={Jöns, Klaus D. and Hafenbrak, R and Singh,
R and Ding, F and Plumhof, J.D and Rastelli, A and Schmidt, O.G and Bester,
G and Michler, P}, year={2011}, pages={217402}, collection={Phys. Rev. Lett.}
}'
chicago: Jöns, Klaus D., R Hafenbrak, R Singh, F Ding, J.D Plumhof, A Rastelli,
O.G Schmidt, G Bester, and P Michler. “Dependence of the Redshifted and Blueshifted
Photoluminescence Spectra of Single In(x)Ga(1−x)As/GaAs Quantum Dots on the Applied
Uniaxial Stress.” Phys. Rev. Lett., 2011.
ieee: K. D. Jöns et al., “Dependence of the Redshifted and Blueshifted Photoluminescence
Spectra of Single In(x)Ga(1−x)As/GaAs Quantum Dots on the Applied Uniaxial Stress,”
vol. 107. p. 217402, 2011.
mla: Jöns, Klaus D., et al. Dependence of the Redshifted and Blueshifted Photoluminescence
Spectra of Single In(x)Ga(1−x)As/GaAs Quantum Dots on the Applied Uniaxial Stress.
2011, p. 217402.
short: K.D. Jöns, R. Hafenbrak, R. Singh, F. Ding, J.D. Plumhof, A. Rastelli,
O.G. Schmidt, G. Bester, P. Michler, 107 (2011) 217402.
date_created: 2023-02-13T08:31:47Z
date_updated: 2023-02-13T08:44:28Z
department:
- _id: '623'
intvolume: ' 107'
language:
- iso: eng
page: '217402'
series_title: Phys. Rev. Lett.
status: public
title: Dependence of the Redshifted and Blueshifted Photoluminescence Spectra of Single
In(x)Ga(1−x)As/GaAs Quantum Dots on the Applied Uniaxial Stress
type: conference
user_id: '71124'
volume: 107
year: '2011'
...
---
_id: '8178'
abstract:
- lang: eng
text: In [Piani et al., PRL106 (2011) 220403], an activation protocol was introduced
which maps the general non-classical (multipartite) correlations between given
systems into bipartite entanglement between the systems and local ancillae by
means of a potentially highly entangling interaction. Here, we study how this
activation protocol can be used to entangle the starting systems themselves via
entanglement swapping through a measurement on the ancillae. Furthermore, we bound
the relative entropy of quantumness (a naturally arising measure of non-classicality
in the scheme of Piani et al. above) for a special class of separable states,
the so-called classical–quantum states. In particular, we fully characterize the
classical–quantum two-qubit states that are maximally non-classical.
article_type: original
author:
- first_name: Sevag
full_name: Gharibian, Sevag
id: '71541'
last_name: Gharibian
orcid: 0000-0002-9992-3379
- first_name: MARCO
full_name: PIANI, MARCO
last_name: PIANI
- first_name: GERARDO
full_name: ADESSO, GERARDO
last_name: ADESSO
- first_name: JOHN
full_name: CALSAMIGLIA, JOHN
last_name: CALSAMIGLIA
- first_name: PAWEŁ
full_name: HORODECKI, PAWEŁ
last_name: HORODECKI
citation:
ama: Gharibian S, PIANI M, ADESSO G, CALSAMIGLIA J, HORODECKI P. Characterizing
Quantumness via Entanglement Creation. International Journal of Quantum Information.
2011;09(07n08):1701-1713. doi:10.1142/s0219749911008258
apa: Gharibian, S., PIANI, M., ADESSO, G., CALSAMIGLIA, J., & HORODECKI, P.
(2011). Characterizing Quantumness via Entanglement Creation. International
Journal of Quantum Information, 09(07n08), 1701–1713. https://doi.org/10.1142/s0219749911008258
bibtex: '@article{Gharibian_PIANI_ADESSO_CALSAMIGLIA_HORODECKI_2011, title={Characterizing
Quantumness via Entanglement Creation}, volume={09}, DOI={10.1142/s0219749911008258},
number={07n08}, journal={International Journal of Quantum Information}, publisher={World
Scientific Pub Co Pte Lt}, author={Gharibian, Sevag and PIANI, MARCO and ADESSO,
GERARDO and CALSAMIGLIA, JOHN and HORODECKI, PAWEŁ}, year={2011}, pages={1701–1713}
}'
chicago: 'Gharibian, Sevag, MARCO PIANI, GERARDO ADESSO, JOHN CALSAMIGLIA, and PAWEŁ
HORODECKI. “Characterizing Quantumness via Entanglement Creation.” International
Journal of Quantum Information 09, no. 07n08 (2011): 1701–13. https://doi.org/10.1142/s0219749911008258.'
ieee: 'S. Gharibian, M. PIANI, G. ADESSO, J. CALSAMIGLIA, and P. HORODECKI, “Characterizing
Quantumness via Entanglement Creation,” International Journal of Quantum Information,
vol. 09, no. 07n08, pp. 1701–1713, 2011, doi: 10.1142/s0219749911008258.'
mla: Gharibian, Sevag, et al. “Characterizing Quantumness via Entanglement Creation.”
International Journal of Quantum Information, vol. 09, no. 07n08, World
Scientific Pub Co Pte Lt, 2011, pp. 1701–13, doi:10.1142/s0219749911008258.
short: S. Gharibian, M. PIANI, G. ADESSO, J. CALSAMIGLIA, P. HORODECKI, International
Journal of Quantum Information 09 (2011) 1701–1713.
date_created: 2019-03-01T12:08:55Z
date_updated: 2023-02-28T11:04:25Z
department:
- _id: '623'
- _id: '7'
doi: 10.1142/s0219749911008258
extern: '1'
external_id:
arxiv:
- '1105.3419'
intvolume: ' 9'
issue: 07n08
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1105.3419
oa: '1'
page: 1701-1713
publication: International Journal of Quantum Information
publication_identifier:
issn:
- 0219-7499
- 1793-6918
publication_status: published
publisher: World Scientific Pub Co Pte Lt
status: public
title: Characterizing Quantumness via Entanglement Creation
type: journal_article
user_id: '71541'
volume: '09'
year: '2011'
...
---
_id: '8176'
abstract:
- lang: eng
text: Approximation algorithms for classical constraint satisfaction problems are
one of the main research areas in theoretical computer science. Here we define
a natural approximation version of the QMA-complete local Hamiltonian problem
and initiate its study. We present two main results. The first shows that a non-trivial
approximation ratio can be obtained in the class NP using product states. The
second result (which builds on the first one), gives a polynomial time (classical)
algorithm providing a similar approximation ratio for dense instances of the problem.
The latter result is based on an adaptation of the "exhaustive sampling method"
by Arora et al. [J. Comp. Sys. Sci. 58, p.193 (1999)] to the quantum setting,
and might be of independent interest.
author:
- first_name: Sevag
full_name: Gharibian, Sevag
id: '71541'
last_name: Gharibian
orcid: 0000-0002-9992-3379
- first_name: Julia
full_name: Kempe, Julia
last_name: Kempe
citation:
ama: 'Gharibian S, Kempe J. Approximation Algorithms for QMA-Complete Problems.
In: IEEE Annual Conference on Computational Complexity (CCC 2011). IEEE;
2011. doi:10.1109/ccc.2011.15'
apa: Gharibian, S., & Kempe, J. (2011). Approximation Algorithms for QMA-Complete
Problems. IEEE Annual Conference on Computational Complexity (CCC 2011).
2011 IEEE 26th Annual Conference on Computational Complexity (CCC), San Jose,
USA. https://doi.org/10.1109/ccc.2011.15
bibtex: '@inproceedings{Gharibian_Kempe_2011, title={Approximation Algorithms for
QMA-Complete Problems}, DOI={10.1109/ccc.2011.15},
booktitle={IEEE Annual Conference on Computational Complexity (CCC 2011)}, publisher={IEEE},
author={Gharibian, Sevag and Kempe, Julia}, year={2011} }'
chicago: Gharibian, Sevag, and Julia Kempe. “Approximation Algorithms for QMA-Complete
Problems.” In IEEE Annual Conference on Computational Complexity (CCC 2011).
IEEE, 2011. https://doi.org/10.1109/ccc.2011.15.
ieee: 'S. Gharibian and J. Kempe, “Approximation Algorithms for QMA-Complete Problems,”
presented at the 2011 IEEE 26th Annual Conference on Computational Complexity
(CCC), San Jose, USA, 2011, doi: 10.1109/ccc.2011.15.'
mla: Gharibian, Sevag, and Julia Kempe. “Approximation Algorithms for QMA-Complete
Problems.” IEEE Annual Conference on Computational Complexity (CCC 2011),
IEEE, 2011, doi:10.1109/ccc.2011.15.
short: 'S. Gharibian, J. Kempe, in: IEEE Annual Conference on Computational Complexity
(CCC 2011), IEEE, 2011.'
conference:
location: San Jose, USA
name: 2011 IEEE 26th Annual Conference on Computational Complexity (CCC)
date_created: 2019-03-01T12:06:18Z
date_updated: 2023-02-28T11:04:02Z
department:
- _id: '623'
- _id: '7'
doi: 10.1109/ccc.2011.15
extern: '1'
external_id:
arxiv:
- '1101.3884'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1101.3884
oa: '1'
publication: IEEE Annual Conference on Computational Complexity (CCC 2011)
publication_identifier:
isbn:
- '9781457701795'
publication_status: published
publisher: IEEE
status: public
title: Approximation Algorithms for QMA-Complete Problems
type: conference
user_id: '71541'
year: '2011'
...
---
_id: '8177'
abstract:
- lang: eng
text: 'We devise a protocol in which general nonclassical multipartite correlations
produce a physically relevant effect, leading to the creation of bipartite entanglement.
In particular, we show that the relative entropy of quantumness, which measures
all nonclassical correlations among subsystems of a quantum system, is equivalent
to and can be operationally interpreted as the minimum distillable entanglement
generated between the system and local ancillae in our protocol. We emphasize
the key role of state mixedness in maximizing nonclassicality: Mixed entangled
states can be arbitrarily more nonclassical than separable and pure entangled
states.'
article_type: original
author:
- first_name: Marco
full_name: Piani, Marco
last_name: Piani
- first_name: Sevag
full_name: Gharibian, Sevag
id: '71541'
last_name: Gharibian
orcid: 0000-0002-9992-3379
- first_name: Gerardo
full_name: Adesso, Gerardo
last_name: Adesso
- first_name: John
full_name: Calsamiglia, John
last_name: Calsamiglia
- first_name: Paweł
full_name: Horodecki, Paweł
last_name: Horodecki
- first_name: Andreas
full_name: Winter, Andreas
last_name: Winter
citation:
ama: Piani M, Gharibian S, Adesso G, Calsamiglia J, Horodecki P, Winter A. All Nonclassical
Correlations Can Be Activated into Distillable Entanglement. Physical Review
Letters. 2011;106(22). doi:10.1103/physrevlett.106.220403
apa: Piani, M., Gharibian, S., Adesso, G., Calsamiglia, J., Horodecki, P., &
Winter, A. (2011). All Nonclassical Correlations Can Be Activated into Distillable
Entanglement. Physical Review Letters, 106(22). https://doi.org/10.1103/physrevlett.106.220403
bibtex: '@article{Piani_Gharibian_Adesso_Calsamiglia_Horodecki_Winter_2011, title={All
Nonclassical Correlations Can Be Activated into Distillable Entanglement}, volume={106},
DOI={10.1103/physrevlett.106.220403},
number={22}, journal={Physical Review Letters}, publisher={American Physical Society
(APS)}, author={Piani, Marco and Gharibian, Sevag and Adesso, Gerardo and Calsamiglia,
John and Horodecki, Paweł and Winter, Andreas}, year={2011} }'
chicago: Piani, Marco, Sevag Gharibian, Gerardo Adesso, John Calsamiglia, Paweł
Horodecki, and Andreas Winter. “All Nonclassical Correlations Can Be Activated
into Distillable Entanglement.” Physical Review Letters 106, no. 22 (2011).
https://doi.org/10.1103/physrevlett.106.220403.
ieee: 'M. Piani, S. Gharibian, G. Adesso, J. Calsamiglia, P. Horodecki, and A. Winter,
“All Nonclassical Correlations Can Be Activated into Distillable Entanglement,”
Physical Review Letters, vol. 106, no. 22, 2011, doi: 10.1103/physrevlett.106.220403.'
mla: Piani, Marco, et al. “All Nonclassical Correlations Can Be Activated into Distillable
Entanglement.” Physical Review Letters, vol. 106, no. 22, American Physical
Society (APS), 2011, doi:10.1103/physrevlett.106.220403.
short: M. Piani, S. Gharibian, G. Adesso, J. Calsamiglia, P. Horodecki, A. Winter,
Physical Review Letters 106 (2011).
date_created: 2019-03-01T12:07:49Z
date_updated: 2023-02-28T11:04:13Z
department:
- _id: '623'
- _id: '7'
doi: 10.1103/physrevlett.106.220403
extern: '1'
external_id:
arxiv:
- '1103.4032'
intvolume: ' 106'
issue: '22'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1103.4032
oa: '1'
publication: Physical Review Letters
publication_identifier:
issn:
- 0031-9007
- 1079-7114
publication_status: published
publisher: American Physical Society (APS)
status: public
title: All Nonclassical Correlations Can Be Activated into Distillable Entanglement
type: journal_article
user_id: '71541'
volume: 106
year: '2011'
...
---
_id: '42030'
article_number: '125606 '
author:
- first_name: D
full_name: ' Richter, D'
last_name: ' Richter'
- first_name: R
full_name: Hafenbrak, R
last_name: Hafenbrak
- first_name: Klaus D.
full_name: Jöns, Klaus D.
id: '85353'
last_name: Jöns
- first_name: W-M
full_name: Schulz, W-M
last_name: Schulz
- first_name: M
full_name: Eichfelder, M
last_name: Eichfelder
- first_name: M
full_name: Heldmaier, M
last_name: Heldmaier
- first_name: R
full_name: Roßbach, R
last_name: Roßbach
- first_name: M
full_name: Jetter, M
last_name: Jetter
- first_name: P
full_name: Michler, P
last_name: Michler
citation:
ama: Richter D, Hafenbrak R, Jöns KD, et al. Low-density MOVPE grown InGaAs QDs
exhibiting ultra-narrow single exciton linewidths. 2010;21.
apa: Richter, D., Hafenbrak, R., Jöns, K. D., Schulz, W.-M., Eichfelder, M., Heldmaier,
M., Roßbach, R., Jetter, M., & Michler, P. (2010). Low-density MOVPE grown
InGaAs QDs exhibiting ultra-narrow single exciton linewidths (No. 125606;
Vol. 21).
bibtex: '@article{ Richter_Hafenbrak_Jöns_Schulz_Eichfelder_Heldmaier_Roßbach_Jetter_Michler_2010,
series={Nanotechnology }, title={Low-density MOVPE grown InGaAs QDs exhibiting
ultra-narrow single exciton linewidths}, volume={21}, number={125606}, author={
Richter, D and Hafenbrak, R and Jöns, Klaus D. and Schulz, W-M and Eichfelder,
M and Heldmaier, M and Roßbach, R and Jetter, M and Michler, P}, year={2010},
collection={Nanotechnology } }'
chicago: Richter, D, R Hafenbrak, Klaus D. Jöns, W-M Schulz, M Eichfelder, M Heldmaier,
R Roßbach, M Jetter, and P Michler. “Low-Density MOVPE Grown InGaAs QDs Exhibiting
Ultra-Narrow Single Exciton Linewidths.” Nanotechnology , 2010.
ieee: D. Richter et al., “Low-density MOVPE grown InGaAs QDs exhibiting
ultra-narrow single exciton linewidths,” vol. 21. 2010.
mla: Richter, D., et al. Low-Density MOVPE Grown InGaAs QDs Exhibiting Ultra-Narrow
Single Exciton Linewidths. 125606, 2010.
short: D. Richter, R. Hafenbrak, K.D. Jöns, W.-M. Schulz, M. Eichfelder, M. Heldmaier,
R. Roßbach, M. Jetter, P. Michler, 21 (2010).
date_created: 2023-02-13T08:19:11Z
date_updated: 2023-02-13T08:44:48Z
department:
- _id: '623'
intvolume: ' 21'
language:
- iso: eng
series_title: 'Nanotechnology '
status: public
title: Low-density MOVPE grown InGaAs QDs exhibiting ultra-narrow single exciton linewidths
type: conference
user_id: '71124'
volume: 21
year: '2010'
...
---
_id: '8179'
abstract:
- lang: eng
text: Given the density matrix rho of a bipartite quantum state, the quantum separability
problem asks whether rho is entangled or separable. In 2003, Gurvits showed that
this problem is NP-hard if rho is located within an inverse exponential (with
respect to dimension) distance from the border of the set of separable quantum
states. In this paper, we extend this NP-hardness to an inverse polynomial distance
from the separable set. The result follows from a simple combination of works
by Gurvits, Ioannou, and Liu. We apply our result to show (1) an immediate lower
bound on the maximum distance between a bound entangled state and the separable
set (assuming P != NP), and (2) NP-hardness for the problem of determining whether
a completely positive trace-preserving linear map is entanglement-breaking.
article_type: original
author:
- first_name: Sevag
full_name: Gharibian, Sevag
id: '71541'
last_name: Gharibian
orcid: 0000-0002-9992-3379
citation:
ama: Gharibian S. Strong NP-hardness of the quantum separability problem. Quantum
Information & Computation. 2010;10(3{\ & }4):343-360.
apa: Gharibian, S. (2010). Strong NP-hardness of the quantum separability problem.
Quantum Information & Computation, 10(3{\ & }4), 343–360.
bibtex: '@article{Gharibian_2010, title={Strong NP-hardness of the quantum separability
problem}, volume={10}, number={3{\ & }4}, journal={Quantum Information &
Computation}, author={Gharibian, Sevag}, year={2010}, pages={343–360} }'
chicago: 'Gharibian, Sevag. “Strong NP-Hardness of the Quantum Separability Problem.”
Quantum Information & Computation 10, no. 3{\ & }4 (2010): 343–60.'
ieee: S. Gharibian, “Strong NP-hardness of the quantum separability problem,” Quantum
Information & Computation, vol. 10, no. 3{\ & }4, pp. 343–360, 2010.
mla: Gharibian, Sevag. “Strong NP-Hardness of the Quantum Separability Problem.”
Quantum Information & Computation, vol. 10, no. 3{\ & }4, 2010,
pp. 343–60.
short: S. Gharibian, Quantum Information & Computation 10 (2010) 343–360.
date_created: 2019-03-01T12:09:59Z
date_updated: 2023-02-28T11:04:38Z
department:
- _id: '623'
- _id: '7'
extern: '1'
external_id:
arxiv:
- '0810.4507'
intvolume: ' 10'
issue: 3{\&}4
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/0810.4507
oa: '1'
page: 343-360
publication: Quantum Information & Computation
publication_status: published
status: public
title: Strong NP-hardness of the quantum separability problem
type: journal_article
user_id: '71541'
volume: 10
year: '2010'
...
---
_id: '8180'
abstract:
- lang: eng
text: 'Given a bipartite quantum state rho with subsystems A and B of arbitrary
dimensions, we study the entanglement detecting capabilities of locally noneffective,
or cyclic, unitary operations [L. B. Fu, Europhys. Lett., vol. 75, pp. 1-7, 2006].
Local cyclic unitaries have the special property that they leave their target
subsystem invariant. We investigate the distance between rho and the global state
after local application of such unitaries as a possible indicator of entanglement.
To this end, we derive and discuss closed formulae for the maximal such distance
achievable for three cases of interest: (pseudo)pure quantum states, Werner states,
and two-qubit states. What makes this criterion interesting, as we show here,
is that it surprisingly displays behavior similar to recent anomalies observed
for non-locality measures in higher dimensions, as well as demonstrates an equivalence
to the CHSH inequality for certain classes of two-qubit states. Yet, despite these
similarities, the criterion is not itself a non-locality measure. We also consider
entanglement detection in bound entangled states.'
article_type: original
author:
- first_name: Sevag
full_name: Gharibian, Sevag
id: '71541'
last_name: Gharibian
orcid: 0000-0002-9992-3379
- first_name: Hermann
full_name: Kampermann, Hermann
last_name: Kampermann
- first_name: Dagmar
full_name: Bru{\ss}, Dagmar
last_name: Bru{\ss}
citation:
ama: Gharibian S, Kampermann H, Bru{\ss} D. On global effects caused by locally
noneffective unitary operations. Quantum Information & Computation.
2009;9(11):1013-1029.
apa: Gharibian, S., Kampermann, H., & Bru{\ss}, D. (2009). On global effects
caused by locally noneffective unitary operations. Quantum Information &
Computation, 9(11), 1013–1029.
bibtex: '@article{Gharibian_Kampermann_Bru{\ss}_2009, title={On global effects caused
by locally noneffective unitary operations}, volume={9}, number={11}, journal={Quantum
Information & Computation}, author={Gharibian, Sevag and Kampermann, Hermann
and Bru{\ss}, Dagmar}, year={2009}, pages={1013–1029} }'
chicago: 'Gharibian, Sevag, Hermann Kampermann, and Dagmar Bru{\ss}. “On Global
Effects Caused by Locally Noneffective Unitary Operations.” Quantum Information
& Computation 9, no. 11 (2009): 1013–29.'
ieee: S. Gharibian, H. Kampermann, and D. Bru{\ss}, “On global effects caused by
locally noneffective unitary operations,” Quantum Information & Computation,
vol. 9, no. 11, pp. 1013–1029, 2009.
mla: Gharibian, Sevag, et al. “On Global Effects Caused by Locally Noneffective
Unitary Operations.” Quantum Information & Computation, vol. 9, no.
11, 2009, pp. 1013–29.
short: S. Gharibian, H. Kampermann, D. Bru{\ss}, Quantum Information & Computation
9 (2009) 1013–1029.
date_created: 2019-03-01T12:12:13Z
date_updated: 2023-02-28T11:04:50Z
department:
- _id: '623'
- _id: '7'
extern: '1'
external_id:
arxiv:
- '0809.4469'
intvolume: ' 9'
issue: '11'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/0809.4469
oa: '1'
page: 1013-1029
publication: Quantum Information & Computation
publication_status: published
status: public
title: On global effects caused by locally noneffective unitary operations
type: journal_article
user_id: '71541'
volume: 9
year: '2009'
...
---
_id: '8181'
abstract:
- lang: eng
text: We investigate signatures of non-classicality in quantum states, in particular,
those involved in the DQC1 model of mixed-state quantum computation [Phys. Rev.
Lett. 81, 5672 (1998)]. To do so, we consider two known non-classicality criteria.
The first quantifies disturbance of a quantum state under locally noneffective
unitary operations (LNU), which are local unitaries acting invariantly on a subsystem.
The second quantifies measurement induced disturbance (MID) in the eigenbasis
of the reduced density matrices. We study the role of both figures of non-classicality
in the exponential speedup of the DQC1 model and compare them vis-a-vis the interpretation
provided in terms of quantum discord. In particular, we prove that a non-zero
quantum discord implies a non-zero shift under LNUs. We also use the MID measure
to study the locking of classical correlations [Phys. Rev. Lett. 92, 067902 (2004)]
using two mutually unbiased bases (MUB). We find the MID measure to exactly correspond
to the number of locked bits of correlation. For three or more MUBs, it predicts
the possibility of superior locking effects.
article_type: original
author:
- first_name: Animesh
full_name: Datta, Animesh
last_name: Datta
- first_name: Sevag
full_name: Gharibian, Sevag
id: '71541'
last_name: Gharibian
orcid: 0000-0002-9992-3379
citation:
ama: Datta A, Gharibian S. Signatures of nonclassicality in mixed-state quantum
computation. Physical Review A. 2009;79(4). doi:10.1103/physreva.79.042325
apa: Datta, A., & Gharibian, S. (2009). Signatures of nonclassicality in mixed-state
quantum computation. Physical Review A, 79(4). https://doi.org/10.1103/physreva.79.042325
bibtex: '@article{Datta_Gharibian_2009, title={Signatures of nonclassicality in
mixed-state quantum computation}, volume={79}, DOI={10.1103/physreva.79.042325},
number={4}, journal={Physical Review A}, publisher={American Physical Society
(APS)}, author={Datta, Animesh and Gharibian, Sevag}, year={2009} }'
chicago: Datta, Animesh, and Sevag Gharibian. “Signatures of Nonclassicality in
Mixed-State Quantum Computation.” Physical Review A 79, no. 4 (2009). https://doi.org/10.1103/physreva.79.042325.
ieee: 'A. Datta and S. Gharibian, “Signatures of nonclassicality in mixed-state
quantum computation,” Physical Review A, vol. 79, no. 4, 2009, doi: 10.1103/physreva.79.042325.'
mla: Datta, Animesh, and Sevag Gharibian. “Signatures of Nonclassicality in Mixed-State
Quantum Computation.” Physical Review A, vol. 79, no. 4, American Physical
Society (APS), 2009, doi:10.1103/physreva.79.042325.
short: A. Datta, S. Gharibian, Physical Review A 79 (2009).
date_created: 2019-03-01T12:12:58Z
date_updated: 2023-02-28T11:05:02Z
department:
- _id: '623'
- _id: '7'
doi: 10.1103/physreva.79.042325
extern: '1'
external_id:
arxiv:
- '0811.4003'
intvolume: ' 79'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/0811.4003
oa: '1'
publication: Physical Review A
publication_identifier:
issn:
- 1050-2947
- 1094-1622
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Signatures of nonclassicality in mixed-state quantum computation
type: journal_article
user_id: '71541'
volume: 79
year: '2009'
...
---
_id: '37680'
article_number: '167902'
author:
- first_name: Ch.
full_name: Silberhorn, Ch.
last_name: Silberhorn
- first_name: N.
full_name: Korolkova, N.
last_name: Korolkova
- first_name: G.
full_name: Leuchs, G.
last_name: Leuchs
citation:
ama: Silberhorn Ch, Korolkova N, Leuchs G. Quantum Key Distribution with Bright
Entangled Beams. Physical Review Letters. 2002;88(16). doi:10.1103/physrevlett.88.167902
apa: Silberhorn, Ch., Korolkova, N., & Leuchs, G. (2002). Quantum Key Distribution
with Bright Entangled Beams. Physical Review Letters, 88(16), Article
167902. https://doi.org/10.1103/physrevlett.88.167902
bibtex: '@article{Silberhorn_Korolkova_Leuchs_2002, title={Quantum Key Distribution
with Bright Entangled Beams}, volume={88}, DOI={10.1103/physrevlett.88.167902},
number={16167902}, journal={Physical Review Letters}, publisher={American Physical
Society (APS)}, author={Silberhorn, Ch. and Korolkova, N. and Leuchs, G.}, year={2002}
}'
chicago: Silberhorn, Ch., N. Korolkova, and G. Leuchs. “Quantum Key Distribution
with Bright Entangled Beams.” Physical Review Letters 88, no. 16 (2002).
https://doi.org/10.1103/physrevlett.88.167902.
ieee: 'Ch. Silberhorn, N. Korolkova, and G. Leuchs, “Quantum Key Distribution with
Bright Entangled Beams,” Physical Review Letters, vol. 88, no. 16, Art.
no. 167902, 2002, doi: 10.1103/physrevlett.88.167902.'
mla: Silberhorn, Ch., et al. “Quantum Key Distribution with Bright Entangled Beams.”
Physical Review Letters, vol. 88, no. 16, 167902, American Physical Society
(APS), 2002, doi:10.1103/physrevlett.88.167902.
short: Ch. Silberhorn, N. Korolkova, G. Leuchs, Physical Review Letters 88 (2002).
date_created: 2023-01-20T09:44:56Z
date_updated: 2023-01-30T13:06:06Z
department:
- _id: '288'
- _id: '15'
- _id: '623'
- _id: '230'
doi: 10.1103/physrevlett.88.167902
intvolume: ' 88'
issue: '16'
keyword:
- General Physics and Astronomy
language:
- iso: eng
publication: Physical Review Letters
publication_identifier:
issn:
- 0031-9007
- 1079-7114
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Quantum Key Distribution with Bright Entangled Beams
type: journal_article
user_id: '26263'
volume: 88
year: '2002'
...