Entanglement purification of gaussian continuous variable quantum states.

作者信息

Duan LM, Giedke G, Cirac JI, Zoller P

机构信息

Institut fur Theoretische Physik, Universitat Innsbruck, A-6020 Innsbruck, Austria and Laboratory of Quantum Communication and Quantum Computation, University of Science and Technology of China, Hefei 230026, China.

出版信息

Phys Rev Lett. 2000 Apr 24;84(17):4002-5. doi: 10.1103/PhysRevLett.84.4002.

DOI:10.1103/PhysRevLett.84.4002

PMID:11019260

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.

摘要