Qubit ZooWe present an entanglement purification protocol and an entanglement concentration protocol in this paper, resorting to cross-Kerr nonlinearities and interference of two coherent beams.
Key Results
- 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.
Links
- Journal: Quantum Information and Computation