@article{23816,
  abstract     = {{Employing the ultrafast control of electronic states of a semiconductor quantum dot in a cavity, we introduce an approach to achieve on-demand emission of single photons with almost perfect indistinguishability and photon pairs with near ideal entanglement. Our scheme is based on optical excitation off resonant to a cavity mode followed by ultrafast control of the electronic states using the time-dependent quantum-confined Stark effect, which then allows for cavity-resonant emission. Our theoretical analysis considers cavity-loss mechanisms, the Stark effect, and phonon-induced dephasing, allowing realistic predictions for finite temperatures.}},
  author       = {{Bauch, David and Heinze, Dirk Florian and Förstner, Jens and Jöns, Klaus and Schumacher, Stefan}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  keywords     = {{tet_topic_qd}},
  pages        = {{085308}},
  title        = {{{Ultrafast electric control of cavity mediated single-photon and photon-pair generation with semiconductor quantum dots}}},
  doi          = {{10.1103/physrevb.104.085308}},
  volume       = {{104}},
  year         = {{2021}},
}

@article{37333,
  author       = {{Krauss-Kodytek, L. and Hannes, W.-R. and Meier, Torsten and Ruppert, C. and Betz, M.}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  number       = {{8}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Nondegenerate two-photon absorption in ZnSe: Experiment and theory}}},
  doi          = {{10.1103/physrevb.104.085201}},
  volume       = {{104}},
  year         = {{2021}},
}

@article{23472,
  author       = {{Krauss-Kodytek, L. and Hannes, Wolf-Rüdiger and Meier, Torsten and Ruppert, C. and Betz, M.}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  number       = {{8}},
  title        = {{{Nondegenerate two-photon absorption in ZnSe: Experiment and theory}}},
  doi          = {{10.1103/physrevb.104.085201}},
  volume       = {{104}},
  year         = {{2021}},
}

@article{21362,
  author       = {{Xue, Yan and Chestnov, Igor and Sedov, Evgeny and Kiktenko, Evgeniy and Fedorov, Aleksey K. and Schumacher, Stefan and Ma, Xuekai and Kavokin, Alexey}},
  issn         = {{2643-1564}},
  journal      = {{Physical Review Research}},
  number       = {{1}},
  title        = {{{Split-ring polariton condensates as macroscopic two-level quantum systems}}},
  doi          = {{10.1103/physrevresearch.3.013099}},
  volume       = {{3}},
  year         = {{2021}},
}

@article{21359,
  author       = {{Barkhausen, Franziska and Pukrop, Matthias and Schumacher, Stefan and Ma, Xuekai}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  number       = {{7}},
  title        = {{{Structuring coflowing and counterflowing currents of polariton condensates in concentric ring-shaped and elliptical potentials}}},
  doi          = {{10.1103/physrevb.103.075305}},
  volume       = {{103}},
  year         = {{2021}},
}

@article{21475,
  author       = {{Frese, Daniel and Wei, Qunshuo and Wang, Yongtian and Cinchetti, Mirko and Huang, Lingling and Zentgraf, Thomas}},
  issn         = {{2330-4022}},
  journal      = {{ACS Photonics}},
  number       = {{4}},
  pages        = {{1013--1019}},
  title        = {{{Nonlinear Bicolor Holography Using Plasmonic Metasurfaces}}},
  doi          = {{10.1021/acsphotonics.1c00028}},
  volume       = {{8}},
  year         = {{2021}},
}

@article{20582,
  author       = {{Berger, Bernd and Schmidt, Daniel and Ma, Xuekai and Schumacher, Stefan and Schneider, Christian and Höfling, Sven and Assmann, Marc}},
  journal      = {{Physical Review B}},
  number       = {{24}},
  pages        = {{245309}},
  publisher    = {{American Physical Society}},
  title        = {{{Formation dynamics of exciton-polariton vortices created by nonresonant annular pumping}}},
  doi          = {{10.1103/PhysRevB.101.245309}},
  volume       = {{101}},
  year         = {{2020}},
}

@article{20773,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>Semiconductor 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 2<jats:italic>π</jats:italic> 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.</jats:p>}},
  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}},
}

@inproceedings{20770,
  author       = {{Hannes, Wolf-Rüdiger and Meier, Torsten}},
  booktitle    = {{Ultrafast Phenomena and Nanophotonics XXIV}},
  editor       = {{Betz, Markus and Elezzabi, Abdulhakem Y.}},
  isbn         = {{9781510633193}},
  pages        = {{112780S}},
  title        = {{{k.p-based multiband simulations of non-degenerate two-photon absorption in bulk GaAs}}},
  doi          = {{10.1117/12.2545924}},
  volume       = {{11278}},
  year         = {{2020}},
}

@article{20563,
  author       = {{Hannes, W.-R. and Trautmann, Alexander and Stein, M. and Schäfer, F. and Koch, M. and Meier, Torsten}},
  journal      = {{Physical Review B}},
  number       = {{7}},
  pages        = {{075203}},
  publisher    = {{American Physical Society}},
  title        = {{{Strongly nonresonant four-wave mixing in semiconductors}}},
  doi          = {{10.1103/PhysRevB.101.075203}},
  volume       = {{101}},
  year         = {{2020}},
}

@article{20772,
  author       = {{Song, Xiaohong and Yang, Shidong and Zuo, Ruixin and Meier, Torsten and Yang, Weifeng}},
  issn         = {{2469-9926}},
  journal      = {{Physical Review A}},
  title        = {{{Enhanced high-order harmonic generation in semiconductors by excitation with multicolor pulses}}},
  doi          = {{10.1103/physreva.101.033410}},
  volume       = {{101}},
  year         = {{2020}},
}

@article{20580,
  author       = {{Ma, Xuekai and Berger, B and Aßmann, M and Driben, R and Meier, Torsten and Schneider, C and Höfling, S and Schumacher, Stefan}},
  issn         = {{2041-1723}},
  journal      = {{Nature Communications}},
  number       = {{1}},
  pages        = {{897}},
  title        = {{{Realization of all-optical vortex switching in exciton-polariton condensates}}},
  doi          = {{10.1038/s41467-020-14702-5}},
  volume       = {{11}},
  year         = {{2020}},
}

@article{20584,
  author       = {{Ren, J and Liao, Q and Huang, H and Li, Y and Gao, T and Ma, Xuekai and Schumacher, Stefan and Yao, J and Bai, S and Fu, H}},
  issn         = {{1530-6992}},
  journal      = {{Nano Letters}},
  number       = {{10}},
  pages        = {{7550--7557}},
  title        = {{{Efficient Bosonic Condensation of Exciton Polaritons in an H-Aggregate Organic Single-Crystal Microcavity.}}},
  doi          = {{10.1021/acs.nanolett.0c03009}},
  volume       = {{20}},
  year         = {{2020}},
}

@article{20585,
  author       = {{Ma, Xuekai and Kartashov, YV and Ferrando, A and Schumacher, Stefan}},
  issn         = {{0146-9592}},
  journal      = {{Optics Letters}},
  number       = {{19}},
  pages        = {{5311--5314}},
  title        = {{{Topological edge states of nonequilibrium polaritons in hollow honeycomb arrays.}}},
  doi          = {{10.1364/ol.405844}},
  volume       = {{45}},
  year         = {{2020}},
}

@article{20587,
  author       = {{Barkhausen, F and Schumacher, Stefan and Ma, Xuekai}},
  issn         = {{0146-9592}},
  journal      = {{Optics Letters}},
  number       = {{5}},
  pages        = {{1192--1195}},
  title        = {{{Multistable circular currents of polariton condensates trapped in ring potentials.}}},
  doi          = {{10.1364/ol.386250}},
  volume       = {{45}},
  year         = {{2020}},
}

@article{20586,
  author       = {{Ma, Xuekai and Kartashov, YV and Kavokin, A and Schumacher, Stefan}},
  issn         = {{0146-9592}},
  journal      = {{Optics Letters}},
  number       = {{20}},
  pages        = {{5700--5703}},
  title        = {{{Chiral condensates in a polariton hexagonal ring.}}},
  doi          = {{10.1364/ol.405400}},
  volume       = {{45}},
  year         = {{2020}},
}

@article{20581,
  author       = {{Pukrop, Matthias and Schumacher, Stefan and Ma, Xuekai}},
  journal      = {{Physical Review B}},
  number       = {{20}},
  pages        = {{205301}},
  publisher    = {{American Physical Society}},
  title        = {{{Circular polarization reversal of half-vortex cores in polariton condensates}}},
  doi          = {{10.1103/PhysRevB.101.205301}},
  volume       = {{101}},
  year         = {{2020}},
}

@article{20583,
  author       = {{Ma, Xuekai and Kartashov, Yaroslav V. and Gao, Tingge and Torner, Lluis and Schumacher, Stefan}},
  journal      = {{Physical Review B}},
  number       = {{4}},
  pages        = {{045309}},
  publisher    = {{American Physical Society}},
  title        = {{{Spiraling vortices in exciton-polariton condensates}}},
  doi          = {{10.1103/PhysRevB.102.045309}},
  volume       = {{102}},
  year         = {{2020}},
}

@article{11953,
  abstract     = {{As flexible optical devices that can manipulate the phase and amplitude of light, metasurfaces would clearly benefit from directional optical properties. However, single layer metasurface systems consisting of two-dimensional nanoparticle arrays exhibit only a weak spatial asymmetry perpendicular to the surface and therefore have mostly symmetric transmission features. Here, we present a metasurface design principle for nonreciprocal polarization encryption of holographic images. Our approach is based on a two-layer plasmonic metasurface design that introduces a local asymmetry and generates a bidirectional functionality with full phase and amplitude control of the transmitted light. The encoded hologram is designed to appear in a particular linear cross-polarization channel, while it is disappearing in the reverse propagation direction. Hence, layered metasurface systems can feature asymmetric transmission with full phase and amplitude control and therefore expand the design freedom in nanoscale optical devices toward asymmetric information processing and security features for anticounterfeiting applications.}},
  author       = {{Frese, Daniel and Wei, Qunshuo and Wang, Yongtian and Huang, Lingling and Zentgraf, Thomas}},
  issn         = {{1530-6984}},
  journal      = {{Nano Letters}},
  number       = {{6}},
  pages        = {{3976--3980}},
  title        = {{{Nonreciprocal Asymmetric Polarization Encryption by Layered Plasmonic Metasurfaces}}},
  doi          = {{10.1021/acs.nanolett.9b01298}},
  volume       = {{19}},
  year         = {{2019}},
}

@article{14544,
  author       = {{Vondran, J. and Spitzer, F. and Bayer, M. and Akimov, I. A. and Trautmann, Alexander and Reichelt, Matthias and Meier, Cedrik and Weber, N. and Meier, Torsten and André, R. and Mariette, H.}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  number       = {{15}},
  pages        = {{155308}},
  title        = {{{Spatially asymmetric transients of propagating exciton-polariton modes in a planar CdZnTe/CdMgTe guiding structure}}},
  doi          = {{10.1103/physrevb.100.155308}},
  volume       = {{100}},
  year         = {{2019}},
}