Abstract
A linear-optical scheme is proposed to implement the nondeterministic two-qubit controlled phase gate in decoherence-free subspace (DFS) with a certain success probability. The proposed setup requires simple linear-optical elements, two pairs of the two-photon polarization entangled states as auxiliary resource, and the conventional photon detectors that only distinguish the vacuum and nonvacuum Fock number states. A sophisticated single-photon detector distinguishing one or two photon states is unnecessary. This makes the protocol more realizable in experiments.
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This work is supported by the National Natural Science Foundation of China under Grant Nos. 61465013, 11465020, and 11264042; the Program for Chun Miao Excellent Talents of Jilin Provincial Department of Education under Grant No. 201316; and the Talent Program of Yanbian University of China under Grant No. 950010001.
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Su, SL., Guo, Q., Wang, HF. et al. Linear-Optical Proposal for Implementation of the Two-Logic-Qubit Controlled Phase Gate in Decoherence-Free Subspace with Conventional Photon Detectors. Int J Theor Phys 55, 447–456 (2016). https://doi.org/10.1007/s10773-015-2679-y
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DOI: https://doi.org/10.1007/s10773-015-2679-y