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The work targets phase drift in long-distance quantum links, a practical bottleneck for entanglement distribution and device-independent key distribution. The reported gains come from a Bayesian estimator that works with sparse single-photon detections and a low reference-probe duty cycle, rather than from more integration time. Readers should weigh the lab-scale results (10 and 100 km fiber, specific photon rates) against the claim of scalable deployment, which still needs field testing.
A Bayesian system stabilizes quantum links at the lowest noise level
A Bayesian phase stabilization technique achieves quantum link integrity at the shot-noise limit, crucial for scalable networks.
Researchers at the Hefei National Laboratory and University of Science and Technology of China have developed a phase-stabilization framework that achieves the shot-noise limit, a fundamental barrier in quantum communication. The system uses a Bayesian phase estimator to extract information from sparse single-photon detection events, outperforming conventional methods while operating with a detected photon rate of approximately 1 million per second and a duty cycle of 6.5 percent or less. This phase control maintains interferometric visibility exceeding 97% over fiber links of 10 and 100 kilometers, enabling long-lived ion-ion entanglement and device-independent quantum key distribution. This achievement circumvents a longstanding trade-off between precision and delay inherent in conventional maximum-likelihood estimation (MLE), which struggles when tracking rapidly evolving phases with limited photon flux. The new framework minimizes the photon budget and duty cycle of reference probes,…
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