Locking Entanglement with a Single Qubit

作     者：Karol Horodecki Michał Horodecki Paweł Horodecki Jonathan Oppenheim 

作者机构：Department of Mathematics Physics and Computer Science University of Gdańsk 80–952 Gdańsk Poland Institute of Theoretical Physics and Astrophysics University of Gdańsk 80–952 Gdańsk Poland Faculty of Applied Physics and Mathematics Technical University of Gdańsk 80–952 Gdańsk Poland Department of Applied Mathematics and Theoretical Physics University of Cambridge Cambridge United Kingdom 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2005年第94卷第20期

页      面：200501-200501页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

主　　题：Quantum theory 

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.