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20 August 2020 On-demand generation of entangled photons in the telecom C-band
Katharina D. Zeuner, Klaus D. Jöns, Lucas Schweickert, Carl Reuterskiöld Hedlund, Carlos Nunez Lobato, Thomas Lettner, Kai Wang, Samuel Gyger, Eva Schöll, Stephan Steinhauer, Mattias Hammar, Valery Zwiller
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Proceedings Volume 11471, Quantum Nanophotonic Materials, Devices, and Systems 2020; 1147103 (2020) https://doi.org/10.1117/12.2567202
Event: SPIE Nanoscience + Engineering, 2020, Online Only
Abstract
Fiber-based quantum networks require on-demand sources of entangled photons in the telecom C-band for long distance information transfer. Historically, the field of in-fiber entanglement distribution has been dominated by photons provided via spontaneous processes. In recent years, semiconductor quantum dots have emerged as strong competitors in terms of generating single and entangled photons due to their promise of deterministic qubit generation in the NIR wavelength region. Here, we show the on-demand generation of polarization entangled photons in the telecom C-band based on InAs/GaAs quantum dots grown via metal-organic vapor-phase epitaxy. By employing a robust phonon-assisted two-photon excitation scheme, we are able to generate pairs of entangled photons with a concurrence of 91.4 ± 3.8 % and a maximum fidelity to the Bell state Φ+ of 95.2 ± 1.1 %.
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Katharina D. Zeuner, Klaus D. Jöns, Lucas Schweickert, Carl Reuterskiöld Hedlund, Carlos Nunez Lobato, Thomas Lettner, Kai Wang, Samuel Gyger, Eva Schöll, Stephan Steinhauer, Mattias Hammar, and Valery Zwiller "On-demand generation of entangled photons in the telecom C-band", Proc. SPIE 11471, Quantum Nanophotonic Materials, Devices, and Systems 2020, 1147103 (20 August 2020); https://doi.org/10.1117/12.2567202
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KEYWORDS
Photons
Quantum dots
Indium arsenide
Quantum networks
Epitaxy
Excitons
Gallium arsenide
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