Dissonance is Required for Assisted Optimal State Discrimination

被引：110

作者：

Roa, Luis ^{[1
]}

Retamal, J. C. ^{[2
]}

Alid-Vaccarezza, M. ^{[1
]}

机构：

[1] Univ Concepcion, Dept Fis, Concepcion, Chile

[2] Univ Santiago Chile, Dept Fis, USACH, Ctr Dev Nanosci & Nanotechnol, Santiago, Chile

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 08期

关键词：

QUANTUM; DIFFERENTIATE;

D O I：

10.1103/PhysRevLett.107.080401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The roles of quantum correlations, entanglement, discord, and dissonance needed for performing unambiguous quantum state discrimination assisted by an auxiliary system are studied. In general, this procedure for conclusive recognition between two nonorthogonal states relies on the availability of entanglement and discord. However, we find that there exist special cases for which the procedure can be successfully achieved without entanglement. In particular, we show that the optimal case for discriminating between two nonorthogonal states prepared with equal a priori probabilities does not require entanglement but quantum dissonance only.

引用

收藏

页数：5

相关论文

共 27 条

[1] Quantum discord for two-qubit X states [J].

Ali, Mazhar ;

Rau, A. R. P. ;

Alber, G. .

PHYSICAL REVIEW A, 2010, 81 (04)

[2] Quantum nonlocality without entanglement [J].

Bennett, CH ;

DiVincenzo, DP ;

Fuchs, CA ;

Mor, T ;

Rains, E ;

Shor, PW ;

Smolin, JA ;

Wootters, WK .

PHYSICAL REVIEW A, 1999, 59 (02) :1070-1091

[3] Universal programmable quantum state discriminator that is optimal for unambiguously distinguishing between unknown states [J].

Bergou, JA ;

Hillery, M .

PHYSICAL REVIEW LETTERS, 2005, 94 (16)

[4] Compromise between neutrino masses and collider signatures in the type-II seesaw model [J].

Chao, Wei ;

Luo, Shu ;

Xing, Zhi-zhong ;

Zhou, Shun .

PHYSICAL REVIEW D, 2008, 77 (01)

[5] Unambiguous discrimination between linearly independent quantum states [J].

Chefles, A .

PHYSICS LETTERS A, 1998, 239 (06) :339-347

[6] Entanglement and the power of one qubit [J].

Datta, A ;

Flammia, ST ;

Caves, CM .

PHYSICAL REVIEW A, 2005, 72 (04)

[7] Role of entanglement and correlations in mixed-state quantum computation [J].

Datta, Animesh ;

Vidal, Guifre .

PHYSICAL REVIEW A, 2007, 75 (04)

[8] Quantum discord and the power of one qubit [J].

Datta, Animesh ;

Shaji, Anil ;

Caves, Carlton M. .

PHYSICAL REVIEW LETTERS, 2008, 100 (05)

[9] OVERLAP AND DISTINGUISHABILITY OF QUANTUM STATES [J].

DIEKS, D .

PHYSICS LETTERS A, 1988, 126 (5-6) :303-306

[10] A comparative study of the optical and circuit representation of the unambiguous quantum state discriminator [J].

Hernandez, Maritza ;

Orszag, Miguel ;

Bergou, Janos A. .

JOURNAL OF MODERN OPTICS, 2010, 57 (03) :181-187