Entanglement Purification of Gaussian Continuous Variable Quantum States

Lu-Ming Duan, G. Giedke, J. I. Cirac, and P. Zoller
Phys. Rev. Lett. 84, 4002 – Published 24 April 2000
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Abstract

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.

  • Received 3 December 1999

DOI:https://doi.org/10.1103/PhysRevLett.84.4002

©2000 American Physical Society

Authors & Affiliations

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

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

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Vol. 84, Iss. 17 — 24 April 2000

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