光电子快报(英文版), 2016, 12 (5): 395, Published Online: Oct. 12, 2017  

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

Author Affiliations
State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an 710071, China
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.

WU Yun-xiang, ZHU Chang-hua, PEI Chang-xing. Nearly deterministic quantum Fredkin gate based on weak cross-Kerr nonlinearity[J]. 光电子快报(英文版), 2016, 12(5): 395.

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