@article{30195,
abstract = {{While plasmonic particles can provide optical resonances in a wide spectral range from the lower visible up to the near-infrared, often, symmetry effects are utilized to obtain particular optical responses. By breaking certain spatial symmetries, chiral structures arise and provide robust chiroptical responses to these plasmonic resonances. Here, we observe strong chiroptical responses in the linear and nonlinear optical regime for chiral L-handed helicoid-III nanoparticles and quantify them by means of an asymmetric factor, the so-called g-factor. We calculate the linear optical g-factors for two distinct chiroptical resonances to −0.12 and –0.43 and the nonlinear optical g-factors to −1.45 and −1.63. The results demonstrate that the chirality of the helicoid-III nanoparticles is strongly enhanced in the nonlinear regime.}},
author = {{Spreyer, Florian and Mun, Jungho and Kim, Hyeohn and Kim, Ryeong Myeong and Nam, Ki Tae and Rho, Junsuk and Zentgraf, Thomas}},
issn = {{2330-4022}},
journal = {{ACS Photonics}},
keywords = {{Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics, Biotechnology, Electronic, Optical and Magnetic Materials}},
number = {{3}},
pages = {{784–792}},
publisher = {{American Chemical Society (ACS)}},
title = {{{Second Harmonic Optical Circular Dichroism of Plasmonic Chiral Helicoid-III Nanoparticles}}},
doi = {{10.1021/acsphotonics.1c00882}},
volume = {{9}},
year = {{2022}},
}
@article{29902,
author = {{Reineke Matsudo, Bernhard and Sain, Basudeb and Carletti, Luca and Zhang, Xue and Gao, Wenlong and Angelis, Costantino and Huang, Lingling and Zentgraf, Thomas}},
issn = {{2198-3844}},
journal = {{Advanced Science}},
keywords = {{General Physics and Astronomy, General Engineering, Biochemistry, Genetics and Molecular Biology (miscellaneous), General Materials Science, General Chemical Engineering, Medicine (miscellaneous)}},
number = {{12}},
publisher = {{Wiley}},
title = {{{Efficient Frequency Conversion with Geometric Phase Control in Optical Metasurfaces}}},
doi = {{10.1002/advs.202104508}},
volume = {{9}},
year = {{2022}},
}
@article{30964,
author = {{Gao, Wenlong and Sain, Basudeb and Zentgraf, Thomas}},
issn = {{2331-7019}},
journal = {{Physical Review Applied}},
keywords = {{General Physics and Astronomy}},
number = {{4}},
publisher = {{American Physical Society (APS)}},
title = {{{Spin-Orbit Interaction of Light Enabled by Negative Coupling in High-Quality-Factor Optical Metasurfaces}}},
doi = {{10.1103/physrevapplied.17.044022}},
volume = {{17}},
year = {{2022}},
}
@inproceedings{34465,
author = {{laeim, Huddad and Schlickriede, Christian and Chaisakul, Papichaya and Chattham, Nattaporn and Panitchakan, Hathai and Siangchaew, Krisda and Zentgraf, Thomas and Pattanaporhratana, Apichart}},
booktitle = {{Metamaterials, Metadevices, and Metasystems 2022}},
editor = {{Engheta, Nader and Noginov, Mikhail A. and Zheludev, Nikolay I.}},
publisher = {{SPIE}},
title = {{{Design and investigation of a metalens for efficiency enhancement of laser-waveguide coupling in a limited space system}}},
doi = {{10.1117/12.2629789}},
year = {{2022}},
}
@article{31480,
abstract = {{Optical geometric phase encoded by in-plane spatial orientation of microstructures has promoted the rapid development of numerous functional meta-devices. However, pushing the concept of the geometric phase toward the acoustic community still faces challenges. In this work, we utilize two acoustic nonlocal metagratings that could support a direct conversion between an acoustic plane wave and a designated vortex mode to obtain the acoustic geometric phase, in which an orbital angular momentum conversion process plays a vital role. In addition, we realize the acoustic geometric phases of different orders by merely varying the orientation angle of the acoustic nonlocal metagratings. Intriguingly, according to our developed theory, we reveal that the reflective acoustic geometric phase, which is twice the transmissive one, can be readily realized by transferring the transmitted configuration to a reflected one. Both the theoretical study and experimental measurements verify the announced transmissive and reflective acoustic geometric phases. Moreover, the reconfigurability and continuous phase modulation that covers the 2π range shown by the acoustic geometric phases provide us with the alternatives in advanced acoustic wavefront control.}},
author = {{Liu, Bingyi and Zhou, Zhiling and Wang, Yongtian and Zentgraf, Thomas and Li, Yong and Huang, Lingling}},
issn = {{0003-6951}},
journal = {{Applied Physics Letters}},
keywords = {{Physics and Astronomy (miscellaneous)}},
number = {{21}},
publisher = {{AIP Publishing}},
title = {{{Experimental verification of the acoustic geometric phase}}},
doi = {{10.1063/5.0091474}},
volume = {{120}},
year = {{2022}},
}
@article{35306,
author = {{Guedes Bonthonneau, Yannick and Weich, Tobias}},
issn = {{1435-9855}},
journal = {{Journal of the European Mathematical Society}},
keywords = {{Applied Mathematics, General Mathematics}},
number = {{3}},
pages = {{851--923}},
publisher = {{European Mathematical Society - EMS - Publishing House GmbH}},
title = {{{Ruelle–Pollicott resonances for manifolds with hyperbolic cusps}}},
doi = {{10.4171/jems/1103}},
volume = {{24}},
year = {{2022}},
}
@article{33671,
abstract = {{Abstract
We demonstrate the fabrication of micron-wide tungsten silicide superconducting nanowire single-photon detectors on a silicon substrate using laser lithography. We show saturated internal detection efficiencies with wire widths ranging from 0.59 µm to 1.43 µm under illumination at 1550 nm. We demonstrate both straight wires, as well as meandered structures. Single-photon sensitivity is shown in devices up to 4 mm in length. Laser-lithographically written devices allow for fast and easy structuring of large areas while maintaining a saturated internal efficiency for wire widths around 1 µm.}},
author = {{Protte, Maximilian and Verma, Varun B and Höpker, Jan Philipp and Mirin, Richard P and Woo Nam, Sae and Bartley, Tim}},
issn = {{0953-2048}},
journal = {{Superconductor Science and Technology}},
keywords = {{Materials Chemistry, Electrical and Electronic Engineering, Metals and Alloys, Condensed Matter Physics, Ceramics and Composites}},
number = {{5}},
publisher = {{IOP Publishing}},
title = {{{Laser-lithographically written micron-wide superconducting nanowire single-photon detectors}}},
doi = {{10.1088/1361-6668/ac5338}},
volume = {{35}},
year = {{2022}},
}
@article{30342,
author = {{Lange, Nina Amelie and Höpker, Jan Philipp and Ricken, Raimund and Quiring, Viktor and Eigner, Christof and Silberhorn, Christine and Bartley, Tim}},
issn = {{2334-2536}},
journal = {{Optica}},
keywords = {{Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials}},
number = {{1}},
publisher = {{The Optical Society}},
title = {{{Cryogenic integrated spontaneous parametric down-conversion}}},
doi = {{10.1364/optica.445576}},
volume = {{9}},
year = {{2022}},
}
@article{33672,
abstract = {{Abstract
Lithium niobate is a promising platform for integrated quantum optics. In this platform, we aim to efficiently manipulate and detect quantum states by combining superconducting single photon detectors and modulators. The cryogenic operation of a superconducting single photon detector dictates the optimisation of the electro-optic modulators under the same operating conditions. To that end, we characterise a phase modulator, directional coupler, and polarisation converter at both ambient and cryogenic temperatures. The operation voltage
V
π
/
2
of these modulators increases, due to the decrease in the electro-optic effect, by 74% for the phase modulator, 84% for the directional coupler and 35% for the polarisation converter below 8.5
K
. The phase modulator preserves its broadband nature and modulates light in the characterised wavelength range. The unbiased bar state of the directional coupler changed by a wavelength shift of 85
n
m
while cooling the device down to 5
K
. The polarisation converter uses periodic poling to phasematch the two orthogonal polarisations. The phasematched wavelength of the utilised poling changes by 112
n
m
when cooling to 5
K
.}},
author = {{Thiele, Frederik and vom Bruch, Felix and Brockmeier, Julian and Protte, Maximilian and Hummel, Thomas and Ricken, Raimund and Quiring, Viktor and Lengeling, Sebastian and Herrmann, Harald and Eigner, Christof and Silberhorn, Christine and Bartley, Tim}},
issn = {{2515-7647}},
journal = {{Journal of Physics: Photonics}},
keywords = {{Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials}},
number = {{3}},
publisher = {{IOP Publishing}},
title = {{{Cryogenic electro-optic modulation in titanium in-diffused lithium niobate waveguides}}},
doi = {{10.1088/2515-7647/ac6c63}},
volume = {{4}},
year = {{2022}},
}
@article{33673,
abstract = {{ Superconducting Nanowire Single Photon Detectors (SNSPDs) have become an integral part of quantum optics in recent years because of their high performance in single photon detection. We present a method to replace the electrical input by supplying the required bias current via the photocurrent of a photodiode situated on the cold stage of the cryostat. Light is guided to the bias photodiode through an optical fiber, which enables a lower thermal conduction and galvanic isolation between room temperature and the cold stage. We show that an off-the-shelf InGaAs–InP photodiode exhibits a responsivity of at least 0.55 A/W at 0.8 K. Using this device to bias an SNSPD, we characterize the count rate dependent on the optical power incident on the photodiode. This configuration of the SNSPD and photodiode shows an expected plateau in the single photon count rate with an optical bias power on the photodiode above 6.8 µW. Furthermore, we compare the same detector under both optical and electrical bias, and show there is no significant changes in performance. This has the advantage of avoiding an electrical input cable, which reduces the latent heat load by a factor of 100 and, in principle, allows for low loss RF current supply at the cold stage. }},
author = {{Thiele, Frederik and Hummel, Thomas and Protte, Maximilian and Bartley, Tim}},
issn = {{2378-0967}},
journal = {{APL Photonics}},
keywords = {{Computer Networks and Communications, Atomic and Molecular Physics, and Optics}},
number = {{8}},
publisher = {{AIP Publishing}},
title = {{{Opto-electronic bias of a superconducting nanowire single photon detector using a cryogenic photodiode}}},
doi = {{10.1063/5.0097506}},
volume = {{7}},
year = {{2022}},
}
@inproceedings{27531,
abstract = {{The Quantum Singular Value Transformation (QSVT) is a recent technique that
gives a unified framework to describe most quantum algorithms discovered so
far, and may lead to the development of novel quantum algorithms. In this paper
we investigate the hardness of classically simulating the QSVT. A recent result
by Chia, Gily\'en, Li, Lin, Tang and Wang (STOC 2020) showed that the QSVT can
be efficiently "dequantized" for low-rank matrices, and discussed its
implication to quantum machine learning. In this work, motivated by
establishing the superiority of quantum algorithms for quantum chemistry and
making progress on the quantum PCP conjecture, we focus on the other main class
of matrices considered in applications of the QSVT, sparse matrices.
We first show how to efficiently "dequantize", with arbitrarily small
constant precision, the QSVT associated with a low-degree polynomial. We apply
this technique to design classical algorithms that estimate, with constant
precision, the singular values of a sparse matrix. We show in particular that a
central computational problem considered by quantum algorithms for quantum
chemistry (estimating the ground state energy of a local Hamiltonian when
given, as an additional input, a state sufficiently close to the ground state)
can be solved efficiently with constant precision on a classical computer. As a
complementary result, we prove that with inverse-polynomial precision, the same
problem becomes BQP-complete. This gives theoretical evidence for the
superiority of quantum algorithms for chemistry, and strongly suggests that
said superiority stems from the improved precision achievable in the quantum
setting. We also discuss how this dequantization technique may help make
progress on the central quantum PCP conjecture.}},
author = {{Gharibian, Sevag and Gall, François Le}},
booktitle = {{Proceedings of the 54th ACM Symposium on Theory of Computing (STOC)}},
pages = {{19--32}},
title = {{{Dequantizing the Quantum Singular Value Transformation: Hardness and Applications to Quantum Chemistry and the Quantum PCP Conjecture}}},
year = {{2022}},
}
@article{31057,
abstract = {{In this paper we give an overview over some aspects of the modern mathematical theory of Ruelle resonances for chaotic, i.e. uniformly hyperbolic, dynamical systems and their implications in physics. First we recall recent developments in the mathematical theory of resonances, in particular how invariant Ruelle distributions arise as residues of weighted zeta functions. Then we derive a correspondence between weighted and semiclassical zeta functions in the setting of negatively curved surfaces. Combining this with results of Hilgert, Guillarmou and Weich yields a high frequency interpretation of invariant Ruelle distributions as quantum mechanical matrix coefficients in constant negative curvature. We finish by presenting numerical calculations of phase space distributions in the more physical setting of 3-disk scattering systems.}},
author = {{Barkhofen, Sonja and Schütte, Philipp and Weich, Tobias}},
journal = {{Journal of Physics A: Mathematical and Theoretical}},
number = {{24}},
publisher = {{IOP Publishing Ltd}},
title = {{{Semiclassical formulae For Wigner distributions}}},
doi = {{10.1088/1751-8121/ac6d2b}},
volume = {{55}},
year = {{2022}},
}
@article{35322,
author = {{Bux, Kai-Uwe and Hilgert, Joachim and Weich, Tobias}},
issn = {{1664-039X}},
journal = {{Journal of Spectral Theory}},
keywords = {{Geometry and Topology, Mathematical Physics, Statistical and Nonlinear Physics}},
number = {{2}},
pages = {{659--681}},
publisher = {{European Mathematical Society - EMS - Publishing House GmbH}},
title = {{{Poisson transforms for trees of bounded degree}}},
doi = {{10.4171/jst/414}},
volume = {{12}},
year = {{2022}},
}
@article{39025,
author = {{Meyer-Scott, Evan and Prasannan, Nidhin and Dhand, Ish and Eigner, Christof and Quiring, Viktor and Barkhofen, Sonja and Brecht, Benjamin and Plenio, Martin B. and Silberhorn, Christine}},
issn = {{0031-9007}},
journal = {{Physical Review Letters}},
keywords = {{General Physics and Astronomy}},
number = {{15}},
publisher = {{American Physical Society (APS)}},
title = {{{Scalable Generation of Multiphoton Entangled States by Active Feed-Forward and Multiplexing}}},
doi = {{10.1103/physrevlett.129.150501}},
volume = {{129}},
year = {{2022}},
}
@article{40273,
author = {{Meyer-Scott, Evan and Prasannan, Nidhin and Dhand, Ish and Eigner, Christof and Quiring, Viktor and Barkhofen, Sonja and Brecht, Benjamin and Plenio, Martin B. and Silberhorn, Christine}},
issn = {{0031-9007}},
journal = {{Physical Review Letters}},
keywords = {{General Physics and Astronomy}},
number = {{15}},
publisher = {{American Physical Society (APS)}},
title = {{{Scalable Generation of Multiphoton Entangled States by Active Feed-Forward and Multiplexing}}},
doi = {{10.1103/physrevlett.129.150501}},
volume = {{129}},
year = {{2022}},
}
@article{33450,
author = {{Hamilton, Craig S. and Christ, Regina and Barkhofen, Sonja and Barnett, Stephen M. and Jex, Igor and Silberhorn, Christine}},
issn = {{2469-9926}},
journal = {{Physical Review A}},
number = {{4}},
publisher = {{American Physical Society (APS)}},
title = {{{Quantum-state creation in nonlinear-waveguide arrays}}},
doi = {{10.1103/physreva.105.042622}},
volume = {{105}},
year = {{2022}},
}
@inproceedings{41879,
author = {{Sbresny, F and Hanschke, L and Schöll, E and Rauhaus, W and Scaparra, B and Boos, K and Casalengua, E.Zubizarreta and H. Riedl, H and Valle, E Del and Finley, J.J and Jöns, Klaus D. and Müller, K}},
title = {{{Stimulated Generation of Indistinguishable Single Photons from a Quantum Ladder System}}},
volume = {{128}},
year = {{2022}},
}
@inproceedings{41880,
author = {{Turunen, M and Brotons-Gisbert, M and Dai, Y and Wang, Y and Scerri, E and Bonato, C and Jöns, Klaus D. and Sun, Z and Gerardot, B.D}},
number = {{4}},
pages = {{219--236}},
title = {{{Quantum photonics with layered 2D materials}}},
volume = {{4}},
year = {{2022}},
}
@inproceedings{41881,
author = {{Pelucchi, E and Fagas, G and Aharonovich, I and Englund, D and Figueroa, E and Gong, Q and Hannes, H and Liu, J and Lu, C-Y and Matsuda, N and Pan, J.W and Schreck, F and Sciarrino, F and Silberhorn, Christine and Wang, J and Jöns, Klaus D.}},
number = {{3}},
pages = {{194--208}},
title = {{{The potential and global outlook of integrated photonics for quantum technologi}}},
volume = {{4}},
year = {{2022}},
}
@article{34700,
author = {{Gharibian, Sevag and Santha, Miklos and Sikora, Jamie and Sundaram, Aarthi and Yirka, Justin}},
issn = {{1016-3328}},
journal = {{Computational Complexity}},
keywords = {{Computational Mathematics, Computational Theory and Mathematics, General Mathematics, Theoretical Computer Science}},
number = {{2}},
publisher = {{Springer Science and Business Media LLC}},
title = {{{Quantum generalizations of the polynomial hierarchy with applications to QMA(2)}}},
doi = {{10.1007/s00037-022-00231-8}},
volume = {{31}},
year = {{2022}},
}