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

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• 作者：Yun-xiang Wu 吴运祥 ; Chang-hua Zhu 朱畅华 ; Chang-xing Pei 裴昌幸
• 刊名：Optoelectronics Letters
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：12
• 期：5
• 页码：395-397
• 全文大小：389 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Applied Optics, Optoelectronics and Optical Devices
  Chinese Library of Science
  
• 出版者：Tianjin University of Technology, co-published with Springer-Verlag GmbH
• ISSN：1993-5013
• 卷排序：12

文摘

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.