QUANTUM LOCKING OF CLASSICAL CORRELATIONS AND QUANTUM DISCORD OF CLASSICAL-QUANTUM STATES

被引:37
作者
Boixo, S. [1 ]
Aolita, L. [2 ]
Cavalcanti, D. [3 ]
Modi, K. [3 ]
Winter, A. [3 ,4 ]
机构
[1] Harvard Univ, Dept Chem & Chem Biol, Cambridge, MA 02138 USA
[2] ICFO Inst Ciencies Foton, Castelldefels 08860, Barcelona, Spain
[3] Natl Univ Singapore, Ctr Quantum Technol, Singapore 117548, Singapore
[4] Univ Bristol, Dept Math, Bristol BS8 1TW, Avon, England
基金
新加坡国家研究基金会; 英国工程与自然科学研究理事会;
关键词
Quantum discord; entanglement; quantum locking; INFORMATION;
D O I
10.1142/S0219749911008301
中图分类号
TP301 [理论、方法];
学科分类号
081202 ;
摘要
A locking protocol between two parties is as follows: Alice gives an encrypted classical message to Bob which she does not want Bob to be able to read until she gives him the key. If Alice is using classical resources, and she wants to approach unconditional security, then the key and the message must have comparable sizes. But if Alice prepares a quantum state, the size of the key can be comparatively negligible. This effect is called quantum locking. Entanglement does not play a role in this quantum advantage. We show that, in this scenario, the quantum discord quantifies the advantage of the quantum protocol over the corresponding classical one for any classical-quantum state.
引用
收藏
页码:1643 / 1651
页数:9
相关论文
共 46 条
[1]   Quantum versus Classical Correlations in Gaussian States [J].
Adesso, Gerardo ;
Datta, Animesh .
PHYSICAL REVIEW LETTERS, 2010, 105 (03)
[2]  
[Anonymous], 2006, Elements of Information Theory
[3]  
[Anonymous], 1984, P IEEE INT C COMP, DOI DOI 10.1016/J.TCS.2014.05.025
[4]  
[Anonymous], 1973, PROBLEMS INFORM TRAN
[5]   Postulates for measures of genuine multipartite correlations [J].
Bennett, Charles H. ;
Grudka, Andrzej ;
Horodecki, Michal ;
Horodecki, Pawel ;
Horodecki, Ryszard .
PHYSICAL REVIEW A, 2011, 83 (01)
[6]   Quantum discord, local operations, and Maxwell's demons [J].
Brodutch, Aharon ;
Terno, Daniel R. .
PHYSICAL REVIEW A, 2010, 81 (06)
[7]   Operational interpretations of quantum discord [J].
Cavalcanti, D. ;
Aolita, L. ;
Boixo, S. ;
Modi, K. ;
Piani, M. ;
Winter, A. .
PHYSICAL REVIEW A, 2011, 83 (03)
[8]   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)
[9]  
Chuang I. N., 2000, Quantum Computation and Quantum Information
[10]   Necessary and Sufficient Condition for Nonzero Quantum Discord [J].
Dakic, Borivoje ;
Vedral, Vlatko ;
Brukner, Caslav .
PHYSICAL REVIEW LETTERS, 2010, 105 (19)