Quantum entanglement enhances the capacity of bosonic channels with memory

Journal Article · Sat Oct 15 04:00:00 EDT 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.72.042330· OSTI ID:20718723

Cerf, Nicolas J; Clavareau, Julien ^[1]; Macchiavello, Chiara ^[2]; Roland, Jeremie ^[1]

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1. QUIC, Ecole Polytechnique, CP 165/59, Universite Libre de Bruxelles, B-1050 Brussels (Belgium)
2. QUIT, Dipartimento di Fisica 'A. Volta', Universita di Pavia, via Bassi 6, I-27100 Pavia (Italy)

The bosonic quantum channels have recently attracted a growing interest, motivated by the hope that they open a tractable approach to the generally hard problem of evaluating quantum channel capacities. These studies, however, have always been restricted to memoryless channels. Here, it is shown that the classical capacity of a bosonic Gaussian channel with memory can be significantly enhanced if entangled symbols are used instead of product symbols. For example, the capacity of a photonic channel with 70%-correlated thermal noise of one-third the shot noise is enhanced by about 11% when using 3.8-dB entangled light with a modulation variance equal to the shot noise.

• OSTI ID: 20718723
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 72; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
COMMUNICATIONS
ENERGY LEVELS
INFORMATION THEORY
MODULATION
NOISE
QUANTUM ENTANGLEMENT
QUANTUM MECHANICS
VISIBLE RADIATION