Metasurface-Based Dual-Basis Polarization Beam Splitter for efficient entanglement witnessing

• URL: http://arxiv.org/abs/2510.03931v1
• Date: Sat, 04 Oct 2025 20:23:25 GMT
• Title: Metasurface-Based Dual-Basis Polarization Beam Splitter for efficient entanglement witnessing
• Authors: Mohamed ElKabbash,
• Abstract summary: Entanglement witnessing is essential for quantum technologies such as computing, key distribution, and networking.<n>We propose a metasurface-based analyzer that performs dual-basis projections simultaneously by mapping them to spatial modes.<n>The proposed scheme provides a path toward efficient entanglement verification with applications in quantum key distribution, quantum repeaters, and scalable quantum networks.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Entanglement witnessing is essential for quantum technologies such as computing, key distribution, and networking. Conventional bulk-optics methods require sequential reconfiguration across multiple polarization bases, limiting efficiency and scalability. We propose a metasurface-based analyzer that performs dual-basis (\sigma_z and \sigma_y) projections simultaneously by mapping them to orthogonal spatial modes. This allows direct access to the commuting two-photon correlators \langle \sigma_z \otimes \sigma_z \rangle and \langle \sigma_y \otimes \sigma_y \rangle required for entanglement witnessing. The metasurface design employs meta-atoms engineered to impart independent linear and circular phase delays through anisotropy and geometric control, resulting in polarization-dependent beam deflection that separates H/V and R/L components. This approach halves the measurement overhead compared to sequential analysis while offering a compact, integrable platform for chip-scale quantum photonics. The proposed scheme provides a path toward efficient entanglement verification with applications in quantum key distribution, quantum repeaters, and scalable quantum networks.

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