Locking entanglement with a single qubit

被引：51

作者：

Horodecki, K ^{[1
]}

Horodecki, M

Horodecki, P

Oppenheim, J

机构：

[1] Univ Gdansk, Dept Math Phys & Comp Sci, PL-80952 Gdansk, Poland

[2] Univ Gdansk, Inst Theoret Phys & Astrophys, PL-80952 Gdansk, Poland

[3] Gdansk Tech Univ, Fac Appl Phys & Math, PL-80952 Gdansk, Poland

[4] Univ Cambridge, Dept Appl Math & Theoret Phys, Cambridge CB3 9EW, England

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.94.200501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the loss of entanglement of a bipartite state subjected to discarding or measurement of one qubit. Examining behavior of different entanglement measures, we find that entanglement of formation, entanglement cost, logarithmic negativity, and one-way distillable entanglement are lockable measures in that they can decrease arbitrarily after measuring one qubit. We prove that any convex and asymptotically noncontinuous measure is lockable. As a consequence, all the convex-roof measures can be locked. The relative entropy of entanglement is shown to be a nonlockable measure.

引用

页数：4

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