Detecting multipartite entanglement

Journal Article · Tue Mar 01 00:00:00 EST 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.71.032333· OSTI ID:20650371

Doherty, Andrew C ^[1]; Parrilo, Pablo A ^[2]; Spedalieri, Federico M ^[3]

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1. School of Physical Sciences, University of Queensland, St Lucia, Queensland 4072 (Australia)
2. Institut fuer Automatik, ETH Zentrum, CH-8092 Zurich (Switzerland)
3. Quantum Computing Technologies Group, Jet Propulsion Laboratory, Pasadena, California 91109 (United States)

We discuss the problem of determining whether the state of several quantum mechanical subsystems is entangled. As in previous work on two subsystems we introduce a procedure for checking separability that is based on finding state extensions with appropriate properties and may be implemented as a semidefinite program. The main result of this work is to show that there is a series of tests of this kind such that if a multiparty state is entangled this will eventually be detected by one of the tests. The procedure also provides a means of constructing entanglement witnesses that could in principle be measured in order to demonstrate that the state is entangled.

• OSTI ID: 20650371
• Journal Information: Physical Review. A, Vol. 71, Issue 3; Other Information: DOI: 10.1103/PhysRevA.71.032333; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

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CORRELATIONS
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