Quantum benchmark for storage and transmission of coherent states

被引：148

作者：

Hammerer, K ^{[1
]}

Wolf, MM

Polzik, ES

Cirac, JI

机构：

[1] Max Planck Inst Quantum Opt, D-85748 Garching, Germany

[2] Danish Res Fdn Ctr Quantum Opt, QUANTOP, Copenhagen, Denmark

[3] Niels Bohr Inst, DK-2100 Copenhagen, Denmark

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.94.150503

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：4

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