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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Acknowledgements
This work is supported by National Natural Science Foundation of China (NSFC) under Grants Nos. 11274010 and 11374085, the Key Program of the Outstanding Young Talent of Anhui Province under Grant Nos. gxyqZD2016206, gxyqZD2016368, gxyqZD2016369 and gxyqZD2016370, the Key Program of the Education Department of Anhui Province under Grant No. KJ2016A511.
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Zang, XP., Yang , M., Wu, WF. et al. Generating multi-mode entangled coherent W and GHZ states via optical system based fusion mechanism. Quantum Inf Process 16, 135 (2017). https://doi.org/10.1007/s11128-017-1591-1
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DOI: https://doi.org/10.1007/s11128-017-1591-1