Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 53: Poster: Quantum Optics and Photonics III
Q 53.51: Poster
Donnerstag, 9. März 2017, 17:00–19:00, P OG2
Quantum Receivers for Coherent Communication — •Sourav Chatterjee1,2,3, Christian R. Müller1,2, Gerd Leuchs1,2, and Christoph Marquardt1,2 — 1MPI for the Science of Light, Erlangen, Germany — 2Department of Physics, FAU, Erlangen, Germany — 3School in Advanced Optical Technologies, Erlangen, Germany
The impossibility of perfectly discriminating non-orthogonal states is vital for quantum key-distribution. In classical communication, however, it imposes strict constraints on the channel capacity. Along with the technological progress, the average optical power per symbol has been continuously decreasing and conventional receiver designs are approaching their sensitivity limit - the standard quantum limit (SQL). Quantum mechanics allows for a much lower error probability compared to SQL, the Helstrom bound. Optimal and near-optimal strategies have been experimentally demonstrated for binary phase-shift keying (PSK) [1]. For quadrature PSK, a hybrid receiver, based on a combination of homodyne- and single photon detection, was demonstrated to outperform the SQL for any signal power [2]. Moreover, a feedback supplemented strategy with photon number resolution technology was proposed [3], and research is in progress to realize it experimentally using FPGAs for real-time feedback. We review the recent progress on quantum receivers and compare different strategies on performance and robustness against technical imperfections.
[1] C. Wittmann et al., Phys. Rev. Lett. 101, 210501 (2008)
[2] C. R. Müller et al., New J. Phys. 14, 083009 (2012)
[3] C. R. Müller et al., New J. Phys. 17, 032003 (2015)