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APS » Journals » Phys. Rev. Lett. » Volume 84 » Issue 12
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Phys. Rev. Lett. 84, 2722–2725 (2000)

Inseparability Criterion for Continuous Variable Systems

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Lu-Ming Duan1,2,*, G. Giedke1, J. I. Cirac1, and P. Zoller1
1Institut für Theoretische Physik, Universität Innsbruck, A-6020 Innsbruck, Austria
2Laboratory of Quantum Communication and Quantum Computation, University of Science and Technology of China, Hefei 230026, China

Received 17 August 1999; published in the issue dated 20 March 2000

An inseparability criterion based on the total variance of a pair of Einstein-Podolsky-Rosen type operators is proposed for continuous variable systems. The criterion provides a sufficient condition for entanglement of any two-party continuous variable states. Furthermore, for all Gaussian states, this criterion turns out to be a necessary and sufficient condition for inseparability.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.2722
DOI:
10.1103/PhysRevLett.84.2722
PACS:
03.67.-a, 03.65.Bz, 42.50.Dv, 89.70.+c

*Email address: luming.duan@uibk.ac.at

 
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