Sudden death of effective entanglement

Krzysztof Roszak; Michał Horodecki; Paweł Horodecki

Sudden death of effective entanglement

Abstract

Sudden death of entanglement is a well-known effect resulting from the finite volume of separable states. We study the case when the observer has a limited measurement capability and analyze the effective entanglement (i.e., entanglement minimized over the output data). We show that in the well-defined system of two quantum dots monitored by single-electron transistors, one may observe a sudden death of effective entanglement when real, physical entanglement is still alive. For certain measurement setups, this occurs even for initial states for which sudden death of physical entanglement is not possible at all. The principles of the analysis may be applied to other analogous scenarios, such as estimation of the parameters arising from quantum process tomography.

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License: Copyright (2010 The American Physical Society)

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Keywords

QUANTUM

Details

Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: PHYSICAL REVIEW A no. 81, pages 423081 - 4,
ISSN: 2469-9926
Language:: English
Publication year:: 2010
Bibliographic description:: Roszak K., Horodecki M., Horodecki P.: Sudden death of effective entanglement// PHYSICAL REVIEW A. -Vol. 81, nr. Iss. 4 (2010), s.423081-4
Verified by:: Gdańsk University of Technology