Generating multi-mode entangled coherent W and GHZ states via optical system based fusion mechanism |
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Authors: | Xue-Ping Zang Ming Yang Wei-Feng Wu Hong-Yi Fan |
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Affiliation: | 1.Department of Materials Science and Engineering,University of Science and Technology of China,Heifei,China;2.School of Mechatronic Engineering,Chizhou University,Chizhou,China;3.School of Physics and Material Science,Anhui University,Hefei,China |
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Abstract: | Fusion technology has been demonstrated to be a good method for generating a large-scale entangled coherent W or GHZ state from two small ones in QED system. It is of importance to study how to fuse small-scale entangled coherent W or GHZ states via optical system. In this paper, we present a scheme for generating larger entangled coherent W or GHZ state in an optical system by virtue of fusion technology. The key fusion mechanism is realized by photon detectors and a Mach–Zehnder interferometer with its two arms immersed in Kerr media, by which an n-mode entangled coherent W state and an m-mode entangled coherent W state can be probabilistically fused into an (\(n+m-2\))-mode entangled coherent W state. This fusion scheme applies to entangled coherent GHZ state too but with a unit probability of success. Feasibility analysis indicates that our fusion scheme may be realized with current experimental technology. Large-scale entangled coherent W and GHZ states may find new applications in quantum communication. |
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