Nearly deterministic quantum Fredkin gate based on weak cross-Kerr nonlinearity

Yun-xiang Wu; Chang-hua Zhu; Chang-xing Pei

doi:10.1007/s11801-016-6149-4

Optoelectronics Letters ›› , Vol. 12 ›› Issue (5) : 395-397. DOI: 10.1007/s11801-016-6149-4

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Nearly deterministic quantum Fredkin gate based on weak cross-Kerr nonlinearity

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Abstract

A scheme of an optical quantum Fredkin gate is presented based on weak cross-Kerr nonlinearity. By an auxiliary coherent state with the cross-Kerr nonlinearity effect, photons can interact with each other indirectly, and a non-demolition measurement for photons can be implemented. Combined with the homodyne detection, classical feedforward, polarization beam splitters and Pauli-X operations, a controlled-path gate is constructed. Furthermore, a quantum Fredkin gate is built based on the controlled-path gate. The proposed Fredkin gate is simple in structure and feasible by current experimental technology.

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Yun-xiang Wu, Chang-hua Zhu, Chang-xing Pei. Nearly deterministic quantum Fredkin gate based on weak cross-Kerr nonlinearity. Optoelectronics Letters, , 12(5): 395‒397 https://doi.org/10.1007/s11801-016-6149-4

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This work has been supported by the National Natural Science Foundation of China (Nos.61372076 and 61301171), and the Programme of Introducing Talents of Discipline to Universities (No.B08038).