Quantum entanglement enhances the capacity of bosonic channels with memory

Abstract

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.

4 pages, 4 figures

References in corpus (1)

• Experimental demonstration of entanglement-enhanced classical communication over a quantum channel with correlated noise

Cited by in corpus (9)

• Experimental characterization of Gaussian quantum communication channels
• A Lossy Bosonic Quantum Channel with Non-Markovian Memory
• Capacities of lossy bosonic channel with correlated noise
• Entanglement and optimal strings of qubits for memory channels
• Qubit channels with small correlations
• Forgetfulness of continuous Markovian quantum channels
• New Phase Transitions in Optimal States for Memory Channels
• Entanglement may enhance the channel capacity in arbitrary dimensions
• Quantum Finite-Depth Memory Channels: Case Study