Effective protocol for preparation of four-photon polarization-entangled decoherence-free states with cross-Kerr nonlinearity
Yan Xia, Mei Lu, Jie Song, Pei-Min Lu, He‐Shan Song · Journal of the Optical Society of America B · 2013
We propose an effective protocol for preparation of four-photon polarization-entangled decoherence-free states with quantum nondemolition detectors. The protocol is based on optical elements, single polarization photons, and cross-Kerr nonlinearity, which are feasible with existing experimental technology. Compared with previous protocols, the present one is to replace the entangled-state resources with much simpler single-photon resources and has a higher success probability. All these advantages make this protocol more efficient and more convenient than others in the applications in quantum communication.