Locking classical correlations in quantum states

被引：177
|
作者：
DiVincenzo, DP
Horodecki, M
Leung, DW
Smolin, JA
Terhal, BM
机构：
[1] IBM Corp, Thomas J Watson Res Ctr, Yorktown Hts, NY 10598 USA
[2] CALTECH, Inst Quantum Informat, Pasadena, CA 91125 USA
[3] Univ Gdansk, Inst Theoret Phys & Astrophys, PL-80952 Gdansk, Poland
[4] Math Sci Res Inst, Berkeley, CA 94720 USA
来源：
PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 06期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1103/PhysRevLett.92.067902
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We show that there exist bipartite quantum states which contain a large locked classical correlation that is unlocked by a disproportionately small amount of classical communication. In particular, there are (2n+1)-qubit states for which a one-bit message doubles the optimal classical mutual information between measurement results on the subsystems, from n/2 bits to n bits. This phenomenon is impossible classically. However, states exhibiting this behavior need not be entangled. We study the range of states exhibiting this phenomenon and bound its magnitude.
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页数：4
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