Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 45: Quantum Information (Quantum Communication) II
Q 45.6: Talk
Thursday, March 14, 2019, 11:45–12:00, S HS 002 Chemie
Communication with a binary alphabet over a phase noise channel — •Ludwig Kunz1,2, Matthew DiMario3, Konrad Banaszek1,2, and Francisco Elohim Becerra3 — 1Centre of New Technologies, University of Warsaw, Warszawa, Poland — 2Faculty of Physics, University of Warsaw, Warszawa, Poland — 3Center for Quantum Information and Control, University of New Mexico, Albuquerque, New Mexico
For reliable optical communication state discrimination is a critical task. Quantum measurements can provide significant enhancement in information transfer compared to classical techniques. However, noise in the communication channel or the measurement limits the benefits of quantum techniques. While linear losses result in simple rescaling of the complex field amplitude, the effects of phase diffusion are less trivial and require new strategies for information retrieval. We investigate a single-shot measurement which shows robustness when communicating over a phase noise channel. In this communication scenario the information is encoded in a binary alphabet of coherent states where the average energy is limited. We consider a measurement based on a displacement operation followed by photon counting with finite photon number resolution. By optimizing the displacement operation, the information transfer can be maximized while at the same time the effect of phase noise is minimized. This communication strategy provides enhancement compared to classical detection when the amplitudes of the alphabet have been optimized for both techniques.