Broadband Characterization of Polarization Mode Dispersion for Quantum Communication Channels

• URL: http://arxiv.org/abs/2607.03202v1
• Date: Fri, 03 Jul 2026 11:15:15 GMT
• Title: Broadband Characterization of Polarization Mode Dispersion for Quantum Communication Channels
• Abstract summary: Wavelength-dependent polarization mode dispersion maps each input state to a trajectory on the Poincaré sphere.<n>We characterize deployed fiber links in Masdar City and demonstrate PMD mitigation by concatenating two channels through a single polarization controller.
• Score: 33.244634732051516
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present a method for characterizing polarization fiber channels carrying broadband quantum signals, where narrowband filtering would waste photon flux. Wavelength-dependent polarization mode dispersion (PMD) maps each input state to a trajectory on the Poincaré sphere; we show that the singular value decomposition of the band-averaged rotation matrix yields, in closed form, the optimal input states, the mutually unbiased measurement bases, and their infidelities. The three singular values provide a compact, bandwidth-dependent channel signature that separates first- from higher-order PMD, and the resulting 5%-infidelity bandwidth gives a practical filtering budget. We characterize deployed fiber links in Masdar City and demonstrate PMD mitigation by concatenating two channels through a single polarization controller.

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