Entanglement purification of Gaussian continuous variable quantum states

Details Entanglement purification of Gaussian continuous variable quantum states Entanglement purification of Gaussian continuous variable quantum states

1999-12-03

arxiv.org/abs/quant-ph/9912017v2

Phys. Rev. Lett. 84, 4002 (2000)

Physics

Quantum Physics

4 pages,1 figure, final version

Scientific paper

10.1103/PhysRevLett.84.4002

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 non-demolition 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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