Quantum memory receiver for superadditive communication using binary coherent states

Abstract

We propose a simple architecture based on multimode quantum memories for collective readout of classical information keyed using a pair coherent states, exemplified by the well-known binary phase shift keying format. Such a configuration enables demonstration of the superadditivity effect in classical communication over quantum channels, where the transmission rate becomes enhanced through joint detection applied to multiple channel uses. The proposed scheme relies on the recently introduced idea to prepare Hadamard sequences of input symbols that are mapped by a linear optical transformation onto the pulse position modulation format [Guha, S. {\em Phys. Rev. Lett.}\ {\bf 2011}, {\em 106}, 240502]. We analyze two versions of readout based on direct detection and an optional Dolinar receiver which implements the minimum-error measurement for individual detection of a binary coherent state alphabet.

9 pages, 3 figures, submitted to Journal of Modern Optics, Special Issue: Quantum Memory

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• The capacity of coherent-state adaptive decoders with interferometry and single-mode detectors
• Searching for interstellar quantum communications
• Spatial spin-wave modulator for quantum memory assisted adaptive measurements
• Structured Optical Receivers for Efficient Deep-Space Communication
• Demonstration of optimal non-projective measurement of binary coherent states with photon counting
• Optimizing deep-space optical communication under power constraints
• Low-cost limit of classical communication with restricted quantum measurements
• Decoding Protocols for Classical Communication on Quantum Channels