In situ quantum verification of polarization-stabilized optical channels

• URL: http://arxiv.org/abs/2510.26034v1
• Date: Thu, 30 Oct 2025 00:19:59 GMT
• Title: In situ quantum verification of polarization-stabilized optical channels
• Authors: Matthew L. Stevens, Noah I. Wasserbeck, Zachary Goisman, Arefur Rahman, John Michael Record, Taman Truong, Ariq Haqq, Muneer Alshowkan, Brian T. Kirby, Nils T. Otterstrom, Joseph M. Lukens,
• Abstract summary: We introduce a novel in situ benchmarking approach that augments a classical polarization tracking system.<n>The method uses the reconstructed map both to validate the classical compensation and to expose noise sources it fails to capture.<n>Our results should unlock new opportunities for in situ channel characterization in quantum-classical coexistence networks.
• Score: 0.712813885457233
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The active stabilization of polarization channels is a task of growing importance as quantum networks move to deployed demonstrations over existing fiber infrastructure. However, the uniquely strict requirements for high-fidelity qubit transmission complicate the extent to which classical solutions may apply to future quantum networks, particularly in terms of recognizing noise sources present in low-flux, nonunitary channels. Here we introduce a novel in situ benchmarking approach that augments a classical polarization tracking system, limited to unitary correction, with simultaneously transmitted quantum light for ancilla-assisted process tomography of the full quantum map. Implemented in a local-area quantum network, our method uses the reconstructed map both to validate the classical compensation and to expose noise sources it fails to capture. A sliding measurement window that continuously updates the estimated quantum process further increases sensitivity to rapid channel fluctuations. Our results should unlock new opportunities for in situ channel characterization in quantum-classical coexistence networks.

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