Information trade-offs for optical quantum communication

Mark M. Wilde, Patrick Hayden, Saikat Guha

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Recent work has precisely characterized the achievable trade-offs between three key information processing tasks-classical communication (generation or consumption), quantum communication (generation or consumption), and shared entanglement (distribution or consumption), measured in bits, qubits, and ebits per channel use, respectively. Slices and corner points of this three-dimensional region reduce to well-known protocols for quantum channels. A trade-off coding technique can attain any point in the region and can outperform time sharing between the best-known protocols for accomplishing each information processing task by itself. Previously, the benefits of trade-off coding that had been found were too small to be of practical value (viz., for the dephasing and the universal cloning machine channels). In this Letter, we demonstrate that the associated performance gains are in fact remarkably high for several physically relevant bosonic channels that model free-space or fiber-optic links, thermal-noise channels, and amplifiers. We show that significant performance gains from trade-off coding also apply when trading photon-number resources between transmitting public and private classical information simultaneously over secret-key-assisted bosonic channels.

Original languageEnglish (US)
Article number140501
JournalPhysical review letters
Volume108
Issue number14
DOIs
StatePublished - Apr 2 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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