Sudden death of effective entanglement

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-defi...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2010-04, Vol.81 (4), Article 042308
Main Authors: Roszak, K., Horodecki, P., Horodecki, R.
Format: Article
Language:English
Subjects:
ATOMIC AND MOLECULAR PHYSICS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DIAGNOSTIC TECHNIQUES
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
LEPTONS
NANOSTRUCTURES
QUANTUM DOTS
QUANTUM ENTANGLEMENT
SEMICONDUCTOR DEVICES
TOMOGRAPHY
TRANSISTORS
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Summary: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.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.81.042308