Mixed state dense coding and its relation to entanglement measures

被引：109

作者：

Bose, S ^{[1
]}

Plenio, MB

Vedral, V

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Opt Sect, London SW7 2BZ, England

[2] Univ Oxford, Clarendon Lab, Ctr Quantum Comp, Oxford OX1 3PU, England

来源：

JOURNAL OF MODERN OPTICS | 2000年 / 47卷 / 2-3期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1080/095003400148213

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Ideal dense coding protocols allow one to use prior maximal entanglement to send two bits of classical information by the physical transfer of a single encoded qubit. We investigate the case when the Drier entanglement is not maximal and the initial state of the entangled pair of qubits being used for the dense coding is a mixed state. We find upper and lower bounds on the capability to do dense coding in terms of the various measures of entanglement. Our results can also be reinterpreted as giving bounds on purification procedures in terms of dense coding capacities.

引用

页码：291 / 310

页数：20

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