Simple and secure quantum key distribution with biphotons

被引：19

作者：

Bregman, I. ^{[1
]}

Aharonov, D. ^{[1
]}

Ben-Or, M. ^{[1
]}

Eisenberg, H. S. ^{[2
]}

机构：

[1] Hebrew Univ Jerusalem, Dept Comp Sci, IL-91904 Jerusalem, Israel

[2] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel

来源：

PHYSICAL REVIEW A | 2008年 / 77卷 / 05期

关键词：

D O I：

10.1103/PhysRevA.77.050301

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The best qubit one-way quantum-key-distribution (QKD) protocol can tolerate up to 14.6% in the error rate. It has been shown how this rate can be increased by using larger quantum systems. The polarization state of a biphoton can encode a three-level quantum system-a qutrit. The realization of a QKD system with biphotons encounters several problems in generating, manipulating, and detecting such photon states. We define those limitations and find within them a few protocols that perform almost as well as the ideal qutrit protocol. One advantage is that these protocols can be implemented with minor modifications into existing single photon systems. The security of one protocol is proved for the most general coherent attacks and the largest acceptable error rate for this protocol is found to be around 17.7%. For comparison, the security of the best possible qutrit protocol of four mutually unbiased bases was also rigorously analyzed against general attacks, with a proven bound on the acceptable error rate of 21.1%.

引用

页数：4

共 25 条

[21] Entanglement of the orbital angular momentum states of photons [J].

Mair, A ;

Vaziri, A ;

Weihs, G ;

Zeilinger, A .

NATURE, 2001, 412 (6844) :313-316

[22] Information-theoretic security proof for quantum-key-distribution protocols [J].

Renner, R ;

Gisin, N ;

Kraus, B .

PHYSICAL REVIEW A, 2005, 72 (01)

[23]

SMITH G, ARXIVQUANTPH0607018

[24] Bell-type test of energy-time entangled qutrits -: art. no. 010503 [J].

Thew, RT ;

Acín, A ;

Zbinden, H ;

Gisin, N .

PHYSICAL REVIEW LETTERS, 2004, 93 (01) :010503-1

[25] OPTIMAL STATE DETERMINATION BY MUTUALLY UNBIASED MEASUREMENTS [J].

WOOTTERS, WK ;

FIELDS, BD .

ANNALS OF PHYSICS, 1989, 191 (02) :363-381

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