A Slow-Time Receiver Interface for Turbulent Free-Space Quantum Polarization Links

• URL: http://arxiv.org/abs/2604.18127v1
• Date: Mon, 20 Apr 2026 11:44:31 GMT
• Title: A Slow-Time Receiver Interface for Turbulent Free-Space Quantum Polarization Links
• Abstract summary: Atmospheric turbulence makes free-space quantum polarization links intrinsically time varying.<n>This paper develops a slow-time receiver interface by extending an aperture-conditioned static model to a temporal domain.<n>Results show that a single static receiver-side parameterization is insufficient to characterize the temporal behavior of free-space quantum links.
• Score: 41.14912220553869
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Atmospheric turbulence makes free-space quantum polarization links intrinsically time varying, whereas receiver-side reduced interfaces are often treated as static. This paper develops a slow-time receiver interface by extending an aperture-conditioned static model to the temporal domain. The receiver-plane phase field, beam-centroid displacement, and scintillation are modeled as hidden slow-time stochastic processes, from which the reduced interface is generated at each instant. A leading-order closure maps coarse-grained phase roughness to an effective polarization-mixing variance while preserving the inherited local polarization-channel family. Aperture conditioning then yields time-dependent effective depolarization, coherence, and detection descriptors. In a representative weak-turbulence case, the polarization branch remains close to the near-ideal regime, with effective depolarization on the order of \(10^{-3}\) and effective coherence close to unity, whereas the detection branch exhibits visibly stronger fluctuations and a longer correlation time. These results show that a single static receiver-side parameterization is insufficient to characterize the temporal behavior of turbulent free-space quantum links. The resulting interface is intended for receiver-side characterization of time-varying quantum links, with MDI-QKD as one representative downstream application.

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