Zi‐Long Yang, Xiao‐Ming Xiu, Liu Lv, Xiao‐Cheng Mo, Si‐Tong Liu, Xin‐Ying Wang, Zi‐Lin Zhao, Zi‐Qing Yuan, Si‐Ge Chen, Xin‐Yi Zhang, Hai‐Kuan Dong, Yan‐Qiang Ji, Li Dong

A Two‐Step Entanglement Concentration for the Less‐Entangled Four‐Photon Cluster States

  • Electrical and Electronic Engineering
  • Computational Theory and Mathematics
  • Condensed Matter Physics
  • Mathematical Physics
  • Nuclear and High Energy Physics
  • Electronic, Optical and Magnetic Materials
  • Statistical and Nonlinear Physics

AbstractEntanglement concentration serves as an essential tool to obtain the maximally entangled states from the less‐entangled states in quantum information processing tasks. An efficient two‐step entanglement concentration protocol (ECP) is proposed to concentrate the less‐entangled four‐photon cluster states with four unknown coefficients into the maximally entangled states in this paper. The protocol utilizes parity‐check gate and photon‐polarized controlled‐Z gate, constructed with a single semiconductor quantum dot in a single optical microcavity (quantum dot‐cavity coupled system) and several linear optical elements. The discarded quantum states can be recycled in the next round concentration to achieve a higher success probability. Under conditions of strong coupling and weak side leakage rate, the ECP can tend toward ideal fidelity and efficiency. Compared to the previously proposed ECPs that utilize various auxiliary tools such as additional entangled states and complex quantum logic gates, the ECP significantly simplifies the analysis process and enables efficient implementation. Thus, the ECP is more economical and feasible in future optical systems.

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