Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 65: Quantum information: Quantum computers and communication II
Q 65.7: Vortrag
Freitag, 21. März 2014, 15:30–15:45, DO26 207
Quantum State Discrimination of Phase Shift-Keyed Coherent States — •Christian R. Müller1,2, Christoffer Wittmann1,2, Mario A. Usuga4, Masahiro Takeoka5, Denis Sych1,2, Ulrik L. Andersen3, Gerd Leuchs1,2, and Christoph Marquardt1,2 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2Department of Physics, University of Erlangen-Nuremberg, Germany — 3Department of Physics, Technical University of Denmark, Kongens Lyngby, Denmark — 4Department of Photonics Engineering, Technical University of Denmark, Kongens Lyngby, Denmark — 5National Institute of Information and Communications Technology, Tokyo, Japan
Coherent states have an outstanding importance in optical communication protocols as they are loss-tolerant and readily produced signal carriers. However, coherent states are mutually non-orthogonal and hence cannot be discriminated without errors [1,2]. We will present quantum receivers for the discrimination of phase-shift keyed alphabets [3]. The error rates are minimized by photon counting detectors and optimized, feedback mediated displacements prior to the detectors. We show that the standard quantum limit can be surpassed significantly for any signal power.
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