Deterministic remote photonic state swapping via quantum walk

doi:10.3969/j.issn.1007-5461.2023.06.012

Abstract

Abstract: Based on a three-step photonic quantum walk scheme, a swapping protocol is proposed for the spatial state and polarization state of two remotely distributed photons, so that the high-quality spatially entangled state and the poor polarization-entangled state of two photons can be swapped, enabling the two remote photons to be in maximally polarization-entangled state. That is to say, the polarization entanglement of the remotely distributed photons can be enhanced with the help of the spatial entanglement of them. Since all the post-selected states are maximally entangled states, the swapping scheme is realized in a deterministic way. The scheme is not only applicable to Werner state but also to arbitrary unknown remote polarization-entangled state, so the scheme is universal in this sense. In addition, half-wave plates and beam displacers used in the scheme are ordinary optical elements, so the scheme is simple and feasible, providing an alternative scheme for manipulating remote polarization entanglement in quantum communication.

Key words: quantum optics, state swapping, quantum walk, spatial degree of freedom

CLC Number:

O431.2

ZENG Miaona , YANG Ming , . Deterministic remote photonic state swapping via quantum walk[J]. Chinese Journal of Quantum Electronics, 2023, 40(6): 924-932.

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