article published David Bauch author Dustin Siebert author Klaus Jöns author 85353 Jens Förstner author 1580000-0001-7059-9862 Stefan Schumacher author 272710000-0003-4042-4951 61 department 230 department 429 department 623 department TRR 142 - C09: TRR 142 - Ideale Erzeugung von Photonenpaaren für Verschränkungsaustausch bei Telekom Wellenlängen (C09*) project TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*) project PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing project <jats:title>Abstract</jats:title><jats:p>The biexciton‐exciton emission cascade commonly used in quantum‐dot systems to generate polarization entanglement yields photons with intrinsically limited indistinguishability. In the present work, it focuses on the generation of pairs of photons with high degrees of polarization entanglement and simultaneously high indistinguishability. It achieves this goal by selectively reducing the biexciton lifetime with an optical resonator. It demonstrates that a suitably tailored circular Bragg reflector fulfills the requirements of sufficient selective Purcell enhancement of biexciton emission paired with spectrally broad photon extraction and twofold degenerate optical modes. The in‐depth theoretical study combines (i) the optimization of realistic photonic structures solving Maxwell's equations from which model parameters are extracted as input for (ii) microscopic simulations of quantum‐dot cavity excitation dynamics with full access to photon properties. It reports non‐trivial dependencies on system parameters and use the predictive power of the combined theoretical approach to determine the optimal range of Purcell enhancement that maximizes indistinguishability and entanglement to near unity values, here specifically for the telecom C‐band at 1550 nm.</jats:p> Wiley2023 eng tet_topic_qd 2511-9044 2511-904410.1002/qute.202300142 https://ris.uni-paderborn.de/record/43246 Bauch D, Siebert D, Jöns K, Förstner J, Schumacher S. On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs. <i>Advanced Quantum Technologies</i>. Published online 2023. doi:<a href="https://doi.org/10.1002/qute.202300142">10.1002/qute.202300142</a> D. Bauch, D. Siebert, K. Jöns, J. Förstner, and S. Schumacher, “On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs,” <i>Advanced Quantum Technologies</i>, 2023, doi: <a href="https://doi.org/10.1002/qute.202300142">10.1002/qute.202300142</a>. Bauch, David, Dustin Siebert, Klaus Jöns, Jens Förstner, and Stefan Schumacher. “On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs.” <i>Advanced Quantum Technologies</i>, 2023. <a href="https://doi.org/10.1002/qute.202300142">https://doi.org/10.1002/qute.202300142</a>. @article{Bauch_Siebert_Jöns_Förstner_Schumacher_2023, title={On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs}, DOI={<a href="https://doi.org/10.1002/qute.202300142">10.1002/qute.202300142</a>}, journal={Advanced Quantum Technologies}, publisher={Wiley}, author={Bauch, David and Siebert, Dustin and Jöns, Klaus and Förstner, Jens and Schumacher, Stefan}, year={2023} } Bauch, David, et al. “On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs.” <i>Advanced Quantum Technologies</i>, Wiley, 2023, doi:<a href="https://doi.org/10.1002/qute.202300142">10.1002/qute.202300142</a>. D. Bauch, D. Siebert, K. Jöns, J. Förstner, S. Schumacher, Advanced Quantum Technologies (2023). Bauch, D., Siebert, D., Jöns, K., Förstner, J., &#38; Schumacher, S. (2023). On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs. <i>Advanced Quantum Technologies</i>. <a href="https://doi.org/10.1002/qute.202300142">https://doi.org/10.1002/qute.202300142</a> 485992023-11-03T10:07:38Z2023-12-21T10:41:17Z