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Hannover 2020 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 41: Quantum Information (Quantum Communication and Quantum Repeater) I

Q 41.2: Vortrag

Donnerstag, 12. März 2020, 11:30–11:45, e001

Single-Photon Distillation with an Atom-Cavity System — •Stephan Welte1, Severin Daiss1, Lukas Hartung1, Emanuele Distante1, Bastian Hacker1,2, Lin Li1,3, and Gerhard Rempe11Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching — 2Present address: Max-Planck-Institut für die Physik des Lichts, Staudtstr. 2, 91058 Erlangen — 3Present address: School of Physics, Huazhong University of Science and Technology, Wuhan, China

Custom-shaped single photons are an indispensable tool for many applications in quantum communication. We distill them out of incoming weak optical pulses that are reflected from and entangled with an atom-cavity system [1]. A suitable measurement on the atom is used to herald the suppression of undesired photon-number contributions. Additionally, the temporal mode profile of the generated photons can be tailored. Out of vacuum-dominated coherent pulses, we distill single photons with a fidelity of 66%. Applying our protocol to state-of-the-art fiber cavities [2] would allow one to reach single-photon fidelities of up to 96%.

[1] S. Daiss, S. Welte, B. Hacker, L. Li, G. Rempe, PRL 122, 133603 (2019)
[2] M. Uphoff, M. Brekenfeld, G. Rempe, S. Ritter, New J. Phys. 17, 013053 (2015)

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