@inproceedings{41892, author = {{Basso Basset, F and Salusti, Francesco and Schweickert, L and Rota, M.B and Tedeschi, D and Covre da Silva, S.F and Roccia, E and Zwiller, V and Jöns, Klaus D. and Rastelli, A and Trotta, R}}, number = {{7}}, title = {{{Quantum Teleportation with Imperfect Quantum Dots}}}, volume = {{7}}, year = {{2021}}, } @inproceedings{63045, abstract = {{We present the ultra-high bandwidth plasmonics platform that enables efficient electro-optic modulation at micrometer scale. Applications in optical communications are discussed.}}, author = {{Hoessbacher, Claudia and Baeuerle, Benedikt and De Leo, Eva and Medico, Nino Del and Duran, Hamit and Güsken, Nicholas Alexander and Habegger, Patrick and Heni, Wolfgang and Meier, Norbert}}, booktitle = {{Conference on Lasers and Electro-Optics}}, publisher = {{Optica Publishing Group}}, title = {{{Progress and Challenges of Plasmonics for Efficient and High-Speed Optical Communications}}}, doi = {{10.1364/cleo_si.2021.stu2b.6}}, year = {{2021}}, } @article{17523, abstract = {{Compact and robust cold atom sources are increasingly important for quantum research, especially for transferring cutting-edge quantum science into practical applications. In this study, we report on a novel scheme that uses a metasurface optical chip to replace the conventional bulky optical elements used to produce a cold atomic ensemble with a single incident laser beam, which is split by the metasurface into multiple beams of the desired polarization states. Atom numbers ~107 and temperatures (about 35 μK) of relevance to quantum sensing are achieved in a compact and robust fashion. Our work highlights the substantial progress toward fully integrated cold atom quantum devices by exploiting metasurface optical chips, which may have great potential in quantum sensing, quantum computing, and other areas.}}, author = {{Zhu, Lingxiao and Liu, Xuan and Sain, Basudeb and Wang, Mengyao and Schlickriede, Christian and Tang, Yutao and Deng, Junhong and Li, Kingfai and Yang, Jun and Holynski, Michael and Zhang, Shuang and Zentgraf, Thomas and Bongs, Kai and Lien, Yu-Hung and Li, Guixin}}, issn = {{2375-2548}}, journal = {{Science Advances}}, number = {{31}}, publisher = {{American Association for the Advancement of Science}}, title = {{{A dielectric metasurface optical chip for the generation of cold atoms}}}, doi = {{10.1126/sciadv.abb6667}}, volume = {{6}}, year = {{2020}}, } @article{16931, author = {{Zhou, Hongqiang and Sain, Basudeb and Wang, Yongtian and Schlickriede, Christian and Zhao, Ruizhe and Zhang, Xue and Wei, Qunshuo and Li, Xiaowei and Huang, Lingling and Zentgraf, Thomas}}, issn = {{1936-0851}}, journal = {{ACS Nano}}, number = {{5}}, pages = {{5553–5559}}, title = {{{Polarization-Encrypted Orbital Angular Momentum Multiplexed Metasurface Holography}}}, doi = {{10.1021/acsnano.9b09814}}, volume = {{14}}, year = {{2020}}, } @article{16944, author = {{Schlickriede, Christian and Kruk, Sergey S. and Wang, Lei and Sain, Basudeb and Kivshar, Yuri and Zentgraf, Thomas}}, issn = {{1530-6984}}, journal = {{Nano Letters}}, number = {{6}}, pages = {{4370–4376}}, title = {{{Nonlinear imaging with all-dielectric metasurfaces}}}, doi = {{10.1021/acs.nanolett.0c01105}}, volume = {{20}}, year = {{2020}}, } @article{31264, abstract = {{AbstractGiven a closed orientable hyperbolic manifold of dimension $$\ne 3$$ ≠ 3 we prove that the multiplicity of the Pollicott-Ruelle resonance of the geodesic flow on perpendicular one-forms at zero agrees with the first Betti number of the manifold. Additionally, we prove that this equality is stable under small perturbations of the Riemannian metric and simultaneous small perturbations of the geodesic vector field within the class of contact vector fields. For more general perturbations we get bounds on the multiplicity of the resonance zero on all one-forms in terms of the first and zeroth Betti numbers. Furthermore, we identify for hyperbolic manifolds further resonance spaces whose multiplicities are given by higher Betti numbers. }}, author = {{Küster, Benjamin and Weich, Tobias}}, issn = {{0010-3616}}, journal = {{Communications in Mathematical Physics}}, keywords = {{Mathematical Physics, Statistical and Nonlinear Physics}}, number = {{2}}, pages = {{917--941}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Pollicott-Ruelle Resonant States and Betti Numbers}}}, doi = {{10.1007/s00220-020-03793-2}}, volume = {{378}}, year = {{2020}}, } @inproceedings{13226, abstract = {{The canonical problem for the class Quantum Merlin-Arthur (QMA) is that of estimating ground state energies of local Hamiltonians. Perhaps surprisingly, [Ambainis, CCC 2014] showed that the related, but arguably more natural, problem of simulating local measurements on ground states of local Hamiltonians (APX-SIM) is likely harder than QMA. Indeed, [Ambainis, CCC 2014] showed that APX-SIM is P^QMA[log]-complete, for P^QMA[log] the class of languages decidable by a P machine making a logarithmic number of adaptive queries to a QMA oracle. In this work, we show that APX-SIM is P^QMA[log]-complete even when restricted to more physical Hamiltonians, obtaining as intermediate steps a variety of related complexity-theoretic results. We first give a sequence of results which together yield P^QMA[log]-hardness for APX-SIM on well-motivated Hamiltonians: (1) We show that for NP, StoqMA, and QMA oracles, a logarithmic number of adaptive queries is equivalent to polynomially many parallel queries. These equalities simplify the proofs of our subsequent results. (2) Next, we show that the hardness of APX-SIM is preserved under Hamiltonian simulations (a la [Cubitt, Montanaro, Piddock, 2017]). As a byproduct, we obtain a full complexity classification of APX-SIM, showing it is complete for P, P^||NP, P^||StoqMA, or P^||QMA depending on the Hamiltonians employed. (3) Leveraging the above, we show that APX-SIM is P^QMA[log]-complete for any family of Hamiltonians which can efficiently simulate spatially sparse Hamiltonians, including physically motivated models such as the 2D Heisenberg model. Our second focus considers 1D systems: We show that APX-SIM remains P^QMA[log]-complete even for local Hamiltonians on a 1D line of 8-dimensional qudits. This uses a number of ideas from above, along with replacing the "query Hamiltonian" of [Ambainis, CCC 2014] with a new "sifter" construction.}}, author = {{Gharibian, Sevag and Piddock, Stephen and Yirka, Justin}}, booktitle = {{Proceedings of the 37th Symposium on Theoretical Aspects of Computer Science (STACS 2020)}}, pages = {{38}}, title = {{{Oracle complexity classes and local measurements on physical Hamiltonians}}}, year = {{2020}}, } @article{37934, author = {{Mukamel, Shaul and Freyberger, Matthias and Schleich, Wolfgang and Bellini, Marco and Zavatta, Alessandro and Leuchs, Gerd and Silberhorn, Christine and Boyd, Robert W and Sánchez-Soto, Luis Lorenzo and Stefanov, André and Barbieri, Marco and Paterova, Anna and Krivitsky, Leonid and Shwartz, Sharon and Tamasaku, Kenji and Dorfman, Konstantin and Schlawin, Frank and Sandoghdar, Vahid and Raymer, Michael and Marcus, Andrew and Varnavski, Oleg and Goodson, Theodore and Zhou, Zhi-Yuan and Shi, Bao-Sen and Asban, Shahaf and Scully, Marlan and Agarwal, Girish and Peng, Tao and Sokolov, Alexei V and Zhang, Zhe-Dong and Zubairy, M Suhail and Vartanyants, Ivan A and del Valle, Elena and Laussy, Fabrice}}, issn = {{0953-4075}}, journal = {{Journal of Physics B: Atomic, Molecular and Optical Physics}}, keywords = {{Condensed Matter Physics, Atomic and Molecular Physics, and Optics}}, number = {{7}}, publisher = {{IOP Publishing}}, title = {{{Roadmap on quantum light spectroscopy}}}, doi = {{10.1088/1361-6455/ab69a8}}, volume = {{53}}, year = {{2020}}, } @article{37935, author = {{Meyer-Scott, Evan and Silberhorn, Christine and Migdall, Alan}}, issn = {{0034-6748}}, journal = {{Review of Scientific Instruments}}, keywords = {{Instrumentation}}, number = {{4}}, publisher = {{AIP Publishing}}, title = {{{Single-photon sources: Approaching the ideal through multiplexing}}}, doi = {{10.1063/5.0003320}}, volume = {{91}}, year = {{2020}}, } @article{37932, abstract = {{Hybrid quantum information processing combines the advantages of discrete and continues variable protocols by realizing protocols consisting of photon counting and homodyne measurements. However, the mode structure of pulsed sources and the properties of the detection schemes often require the use of optical filters in order to combine both detection methods in a common experiment. This limits the efficiency and the overall achievable squeezing of the experiment. In our work, we use photon subtraction to implement the distillation of pulsed squeezed states originating from a genuinely spatially and temporally single-mode parametric down-conversion source in non-linear waveguides. Due to the distillation, we witness an improvement of 0.17 dB from an initial squeezing value of −1.648 ± 0.002 dB, while achieving a purity of 0.58, and confirm the non-Gaussianity of the distilled state via the higher-order cumulants. With this, we demonstrate the source’s suitability for scalable hybrid quantum network applications with pulsed quantum light.}}, author = {{Dirmeier, Thomas and Tiedau, Johannes and Khan, Imran and Ansari, Vahid and Müller, Christian R. and Silberhorn, Christine and Marquardt, Christoph and Leuchs, Gerd}}, issn = {{1094-4087}}, journal = {{Optics Express}}, keywords = {{Atomic and Molecular Physics, and Optics}}, number = {{21}}, publisher = {{Optica Publishing Group}}, title = {{{Distillation of squeezing using an engineered pulsed parametric down-conversion source}}}, doi = {{10.1364/oe.402178}}, volume = {{28}}, year = {{2020}}, } @inproceedings{41894, author = {{Schöll, E and Schweickert, L and Hanschke, L and Zeuner, K.D and Sbresny, F and Lettner, T and Trivedi, R and Reindl, M and Covre da Silva, S.F and Trotta, R and Finley, J.J and Vučković, J and Müller, K and Rastelli, A and Zwiller, V and Jöns, Klaus D.}}, pages = {{ 233605 }}, title = {{{Crux of Using the Cascaded Emission of a Three-Level Quantum Ladder System to Generate Indistinguishable Photons}}}, volume = {{125}}, year = {{2020}}, } @inproceedings{41896, author = {{Barthelmi, K and Klein, J and Hötger, A and Sigl, L and Sigger, F and Mitterreiter, E and Rey, S and Gyger, S and Lorke, M and Florian, M and Jahnke, F and Taniguchi, T and Watanabe, K and Zwiller, V and Jöns, Klaus D. and Wurstbauer, U and Kastl, C and Weber-Bargioni, A and Finley, J.J and Müller, K and Holleitner, A.W}}, pages = {{070501 }}, title = {{{Atomistic defects as single-photon emitters in atomically thin MoS2}}}, volume = {{117}}, year = {{2020}}, } @inproceedings{41895, author = {{Hanschke, L and Schweickert, L and Camilo López Carreño, J and Schöll, E and Zeuner, K.D and Lettner, T and Zubizarreta Casalengua, E and Reindl, M and Covre da Silva, S.F and Trotta, R and Finley, J.J and Rastelli, A and Del Valle, E and Laussy, F.P and Zwiller, V and Müller, K and Jöns, Klaus D.}}, title = {{{Origin of Antibunching in Resonance Fluorescence}}}, volume = {{125}}, year = {{2020}}, } @inproceedings{41897, author = {{Steinhauer, S and Yang, , L and Gyger, S and Lettner, T and Errando-Herranz, C and Jöns, Klaus D and Baghban, M.A and Gallo, K and Zichi, J and Zwiller, V}}, title = {{{NbTiN thin films for superconducting photon detectors on photonic and two-dimensional materials}}}, volume = {{116}}, year = {{2020}}, } @inproceedings{41898, author = {{Lettner, T and Zeuner, K.D and Schöll, E and Huang, H and Scharmer, S and Covre da Silva, S.F and Gyger, S and Schweickert, L.K and Rastelli, A and Jöns, Klaus D. and Zwiller, V}}, number = {{1}}, pages = {{29--35}}, title = {{{A GaAs quantum dot in a parabolic microcavity tuned to 87Rb D1}}}, volume = {{7}}, year = {{2020}}, } @inproceedings{8426, abstract = {{A central tenet of theoretical cryptography is the study of the minimal assumptions required to implement a given cryptographic primitive. One such primitive is the one-time memory (OTM), introduced by Goldwasser, Kalai, and Rothblum [CRYPTO 2008], which is a classical functionality modeled after a non-interactive 1-out-of-2 oblivious transfer, and which is complete for one-time classical and quantum programs. It is known that secure OTMs do not exist in the standard model in both the classical and quantum settings. Here, we propose a scheme for using quantum information, together with the assumption of stateless (i.e., reusable) hardware tokens, to build statistically secure OTMs. Via the semidefinite programming-based quantum games framework of Gutoski and Watrous [STOC 2007], we prove security for a malicious receiver, against a linear number of adaptive queries to the token, in the quantum universal composability framework. We prove stand-alone security against a malicious sender, but leave open the question of composable security against a malicious sender, as well as security against a malicious receiver making a polynomial number of adaptive queries. Compared to alternative schemes derived from the literature on quantum money, our scheme is technologically simple since it is of the "prepare-and measure" type. We also show our scheme is "tight" according to two scenarios.}}, author = {{Broadbent, Anne and Gharibian, Sevag and Zhou, Hong-Sheng}}, booktitle = {{Proceedings of the 15th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC)}}, pages = {{6:1--6:25}}, publisher = {{Leibniz International Proceedings in Informatics (LIPIcs)}}, title = {{{Towards Quantum One-Time Memories from Stateless Hardware}}}, volume = {{158}}, year = {{2020}}, } @article{16927, author = {{Gharibian, Sevag and Aldi, Marco and de Beaudrap, Niel and Saeedi, Seyran}}, journal = {{Communications in Mathematical Physics}}, title = {{{On efficiently solvable cases of Quantum k-SAT}}}, year = {{2020}}, } @article{26289, author = {{Nitsche, Thomas and De, Syamsundar and Barkhofen, Sonja and Meyer-Scott, Evan and Tiedau, Johannes and Sperling, Jan and Gábris, Aurél and Jex, Igor and Silberhorn, Christine}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, title = {{{Local Versus Global Two-Photon Interference in Quantum Networks}}}, doi = {{10.1103/physrevlett.125.213604}}, year = {{2020}}, } @article{20773, abstract = {{AbstractSemiconductor quantum dots are excellent candidates for ultrafast coherent manipulation of qubits by laser pulses on picosecond timescales or even faster. In inhomogeneous ensembles a macroscopic optical polarization decays rapidly due to dephasing, which, however, is reversible in photon echoes carrying complete information about the coherent ensemble dynamics. Control of the echo emission time is mandatory for applications. Here, we propose a concept to reach this goal. In a two-pulse photon echo sequence, we apply an additional resonant control pulse with multiple of 2π area. Depending on its arrival time, the control slows down dephasing or rephasing of the exciton ensemble during its action. We demonstrate for self-assembled (In,Ga)As quantum dots that the photon echo emission time can be retarded or advanced by up to 5 ps relative to its nominal appearance time without control. This versatile protocol may be used to obtain significantly longer temporal shifts for suitably tailored control pulses.}}, author = {{Kosarev, Alexander N. and Rose, Hendrik and Poltavtsev, Sergey V. and Reichelt, Matthias and Schneider, Christian and Kamp, Martin and Höfling, Sven and Bayer, Manfred and Meier, Torsten and Akimov, Ilya A.}}, issn = {{2399-3650}}, journal = {{Communications Physics}}, number = {{1}}, title = {{{Accurate photon echo timing by optical freezing of exciton dephasing and rephasing in quantum dots}}}, doi = {{10.1038/s42005-020-00491-2}}, volume = {{3}}, year = {{2020}}, } @article{63046, author = {{Güsken, Nicholas Alexander and Lauri, Alberto and Li, Yi and Jacassi, Andrea and Matsui, Takayuki and Doiron, Brock and Bower, Ryan and Regoutz, Anna and Mihai, Andrei and Petrov, Peter K. and Oulton, Rupert F. and Cohen, Lesley F. and Maier, Stefan A.}}, issn = {{2059-8521}}, journal = {{MRS Advances}}, number = {{35-36}}, pages = {{1843--1850}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{IR hot carrier based photodetection in titanium nitride oxide thin film-Si junctions}}}, doi = {{10.1557/adv.2020.129}}, volume = {{5}}, year = {{2020}}, }