Capacities of Lossy Bosonic Memory Channels

2009/03/16 by Cosmo Lupo, Vittorio Giovannetti, Stefano Mancini · 3 citations
Computer Science · Physics and Astronomy · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #quant-ph

paper · pdf · doi:10.1103/physrevlett.104.030501

published as Phys. Rev. Lett. 104, 030501 (2010) · 4 pages, 2 fugures. Comments are welcome

arxiv created 2009/03/16 · openalex publication_date 2010/01/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We introduce a general model describing correlated noise effects in quantum optical communication via attenuating media. The memory effects account for the environment finite relaxation times, which are unavoidable in any realistic model. The use of a proper set of collective field variables allows us to unravel the memory, showing that the n-fold concatenation of the memory channel is unitarily equivalent to the direct product of n single-mode lossy bosonic channels. We then compute the ultimate (classical and quantum) transmission rates, showing their enhancement with respect to the memoryless case and proving that coherent state encoding is optimal.

Citations

• Experimental Demonstration of Entanglement-Enhanced Classical Communication over a Quantum Channel with Correlated Noise
• High-fidelity transmission of entanglement over a high-loss free-space channel

Cited by

• Transitional behavior of quantum Gaussian memory channels
• Capacities of linear quantum optical systems
• Enhanced quantum communication via optical refocusing