Structured optical receivers to attain superadditive capacity and the Holevo limit

2011/01/07 by Saikat Guha · 2 citations
Physics and Astronomy · Computer Science · Mathematics · #quant-ph #cs.IT #math.IT

paper · pdf · doi:10.1103/physrevlett.106.240502

published as Phys. Rev. Lett. 106, 240502 (2011) · 4 pages, 4 figures

arxiv created 2011/01/07 · arxiv updated 2015/03/17

Abstract

When classical information is sent over a quantum channel, attaining the ultimate limit to channel capacity requires the receiver to make joint measurements over long codeword blocks. For a pure-state channel, we construct a receiver that can attain the ultimate capacity by applying a single-shot unitary transformation on the received quantum codeword followed by simultaneous (but separable) projective measurements on the single-modulation-symbol state spaces. We study the ultimate limits of photon-information-efficient communications on a lossy bosonic channel. Based on our general results for the pure-state quantum channel, we show some of the first concrete examples of codes and structured joint-detection optical receivers that can achieve fundamentally higher (superadditive) channel capacity than conventional receivers that detect each modulation symbol individually.

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• Quantum-Limited Blind Source Separation of Classical Light
• Quantum-Enhanced Change Detection and Joint Communication-Detection

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