article published Dirk Heinze author Artur Zrenner author 6060000-0002-5190-0944 Stefan Schumacher author 272710000-0003-4042-4951 15 department 230 department 35 department 170 department 297 department 429 department TRR 142 project TRR 142 - Project Area A project TRR 142 - Subproject A3 project TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen project Semiconductor quantum dots are promising sources for polarization-entangled photons. As an alternative to the usual cascaded biexciton-exciton emission, direct two-photon emission from the biexciton can be used. With a high-quality optical resonator tuned to half the biexciton energy, a large proportion of the photons can be steered into the two-photon emission channel. In this case the degree of polarization entanglement is inherently insensitive to the exciton fine-structure splitting. In the present work we analyze the biexciton emission with particular emphasis on the influence of coupling of the quantum-dot cavity system to its environment. Especially for a high-quality cavity, the coupling to the surrounding semiconductormaterial can open up additional phonon-assisted decay channels. Our analysis demonstrates that with the cavity tuned to half the biexciton energy, the potentially detrimental influence of the phonons on the polarization entanglement is strongly suppressed—high degrees of entanglement can still be achieved. We further discuss spectral properties and statistics of the emitted twin photons. 2017 eng 1098-012110.1103/PhysRevB.95.245306 24 Heinze, Dirk, Artur Zrenner, and Stefan Schumacher. “Polarization-Entangled Twin Photons from Two-Photon Quantum-Dot Emission.” <i>Physical Review B</i>, no. 24 (2017). <a href="https://doi.org/10.1103/PhysRevB.95.245306">https://doi.org/10.1103/PhysRevB.95.245306</a>. D. Heinze, A. Zrenner, and S. Schumacher, “Polarization-entangled twin photons from two-photon quantum-dot emission,” <i>Physical Review B</i>, no. 24, 2017, doi: <a href="https://doi.org/10.1103/PhysRevB.95.245306">10.1103/PhysRevB.95.245306</a>. Heinze D, Zrenner A, Schumacher S. Polarization-entangled twin photons from two-photon quantum-dot emission. <i>Physical Review B</i>. 2017;(24). doi:<a href="https://doi.org/10.1103/PhysRevB.95.245306">10.1103/PhysRevB.95.245306</a> D. Heinze, A. Zrenner, S. Schumacher, Physical Review B (2017). @article{Heinze_Zrenner_Schumacher_2017, title={Polarization-entangled twin photons from two-photon quantum-dot emission}, DOI={<a href="https://doi.org/10.1103/PhysRevB.95.245306">10.1103/PhysRevB.95.245306</a>}, number={24}, journal={Physical Review B}, author={Heinze, Dirk and Zrenner, Artur and Schumacher, Stefan}, year={2017} } Heinze, Dirk, et al. “Polarization-Entangled Twin Photons from Two-Photon Quantum-Dot Emission.” <i>Physical Review B</i>, no. 24, 2017, doi:<a href="https://doi.org/10.1103/PhysRevB.95.245306">10.1103/PhysRevB.95.245306</a>. Heinze, D., Zrenner, A., &#38; Schumacher, S. (2017). Polarization-entangled twin photons from two-photon quantum-dot emission. <i>Physical Review B</i>, <i>24</i>. <a href="https://doi.org/10.1103/PhysRevB.95.245306">https://doi.org/10.1103/PhysRevB.95.245306</a> 34352018-07-05T12:08:38Z2025-12-05T14:35:08Z