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<p>Bell state analysis (BSA) is an essential operation for distinguishing Bell states in numerous quantum information processing (QIP) protocols. Here, we propose a linear optical scheme to distinguish four polarization Bell states by exploiting orbital angular momentum (OAM) degree of freedom (DOF) as a self-assisted resource. The linear-optics-based architecture circumvents the inherent limitations of nonlinear optical interactions, and the self-assisted entanglement eliminates the requirement for auxiliary photons—a major challenge in practical QIP implementations. This deterministic BSA scheme offers a promising route toward practical and high-performance QIP tasks in photonic systems.</p>

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Polarization Bell state analysis using orbital angular momentum entanglement in linear optics

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Zi-Long Yang,
  • Shi-Wen He,
  • Zheng Liu,
  • Si-Tong Jin,
  • Xiao-Ming Xiu,
  • Lin-Cheng Wang,
  • Chong Li

摘要

Bell state analysis (BSA) is an essential operation for distinguishing Bell states in numerous quantum information processing (QIP) protocols. Here, we propose a linear optical scheme to distinguish four polarization Bell states by exploiting orbital angular momentum (OAM) degree of freedom (DOF) as a self-assisted resource. The linear-optics-based architecture circumvents the inherent limitations of nonlinear optical interactions, and the self-assisted entanglement eliminates the requirement for auxiliary photons—a major challenge in practical QIP implementations. This deterministic BSA scheme offers a promising route toward practical and high-performance QIP tasks in photonic systems.