Multimode entanglement in reconfigurable graph states using optical frequency combs

Abstract : Multimode entanglement is an essential resource for quantum information processing and quantum metrology. However, multimode entangled states are generally constructed by targeting a specific graph configuration. This yields to a fixed experimental setup that therefore exhibits reduced versatility and scalability. Here we demonstrate an optical on-demand, reconfigurable multimode entangled state, using an intrinsically multimode quantum resource and a homodyne detection apparatus. Without altering either the initial squeezing source or experimental architecture, we realize the construction of thirteen cluster states of various sizes and connectivities as well as the implementation of a secret sharing protocol. In particular, this system enables the interrogation of quantum correlations and fluctuations for any multimode Gaussian state. This initiates an avenue for implementing on-demand quantum information processing by only adapting the measurement process and not the experimental layout.
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Nature Communications, Nature Publishing Group, 2017, 8, pp.15645. 〈10.1038/ncomms15645〉
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Y. Cai, J. Roslund, G. Ferrini, F. Arzani, X. Xu, et al.. Multimode entanglement in reconfigurable graph states using optical frequency combs. Nature Communications, Nature Publishing Group, 2017, 8, pp.15645. 〈10.1038/ncomms15645〉. 〈hal-01541872〉

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