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Measurable entanglement criterion for two qubits
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.ORCID iD: 0000-0002-2082-9583
2003 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 68, no 6Article in journal (Refereed) Published
Abstract [en]

We propose a directly measurable criterion for the entanglement of two qubits. We compare the criterion with other criteria, and we find that for pure states, and some mixed states, it coincides with the state's concurrence. The measure can be obtained with a Bell-state analyzer and the ability to make general local unitary transformations. However, the procedure fails to measure the entanglement of a general mixed two-qubit state.

Place, publisher, year, edition, pages
2003. Vol. 68, no 6
Keyword [en]
states, difference, separability, phase
Identifiers
URN: urn:nbn:se:kth:diva-23075DOI: 10.1103/PhysRevA.68.062314ISI: 000187885000032OAI: oai:DiVA.org:kth-23075DiVA, id: diva2:341773
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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Björk, Gunnar

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