Quantum benchmark for storage and transmission of coherent states

K. Hammerer, M. M. Wolf, E. S. Polzik, J. I. Cirac

Research output: Contribution to journalArticlepeer-review

165 Scopus citations

Abstract

We consider the storage and transmission of a Gaussian distributed set of coherent states of continuous variable systems. We prove a limit on the average fidelity achievable when the states are transmitted or stored by a classical channel, i.e., a measure and repreparation scheme which sends or stores classical information only. The obtained bound is tight and serves as a benchmark which has to be surpassed by quantum channels in order to outperform any classical strategy. The success in experimental demonstrations of quantum memories as well as quantum teleportation has to be judged on this footing.

Original languageEnglish
Article number150503
JournalPhysical Review Letters
Volume94
Issue number15
DOIs
StatePublished - 22 Apr 2005
Externally publishedYes

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