Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 17, Pages 4002-4005Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.4002
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We describe an entanglement purification protocol to generate maximally entangled states with high efficiencies from two-mode squeezed states or from mixed Gaussian continuous entangled states. The protocol relies on a local quantum nondemolition measurement of the total excitation number of several continuous variable entangled pairs. We propose an optical scheme to do this kind of measurement using cavity enhanced cross-Kerr interactions.
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