Polarization-entanglement purification and concentration using cross-kerr nonlinearity

Authors:
Chuan Wang;Yong Zhang;Guang-Sheng Jin
Affiliations:
School of Science and State Key Laboratory of Information photonics and Optical Communications, Beijing University of Posts and Telecommunications and Department of Physics, Tsinghua University, B ...;School of Science and State Key Laboratory of Information photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, People's Republic of China;School of Science and State Key Laboratory of Information photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, People's Republic of China
Venue:
Quantum Information & Computation
Year:
2011

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Abstract

We present an entanglement purification protocol and an entanglement concentration protocol in this paper, resorting to cross-Kerr nonlinearities and interference of two coherent beams. Our purification protocol can be used to purify photon pairs not only from an ideal entangled source but also from a parametric down-conversion source by the measurement on the interference of two coherent beams without giant cross-Kerr media. Our quantum nondemolition detection can also used to concentrate photon pairs in less entangled pure states efficiently. Our protocols are more flexibilities in distinguishing the phases of the coherent states during homodyne detection.