Sudden death of effective entanglement
- Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, 12116 Prague (Czech Republic)
- Faculty of Applied Physics and Mathematics, Gdansk University of Technology, 80-952 Gdansk (Poland)
- National Quantum Information Centre of Gdansk, 81-824 Sopot (Poland)
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.
- OSTI ID:
- 21408570
- Journal Information:
- Physical Review. A, Vol. 81, Issue 4; Other Information: DOI: 10.1103/PhysRevA.81.042308; (c) 2010 The American Physical Society; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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