Rate-Fidelity Control for Wide-Area Quantum Links
Abstract
Quantum network links must distribute entanglement at high rates while satisfying application-specified fidelity demands. However, wide-area deployed fiber links suffer from polarization drift which destabilizes end-to-end fidelity and forces periodic compensation. Current deployments often use active stabilization with fixed control policies, and improvements generally stem from advances in quantum hardware. Meanwhile, software control remains relatively underexplored. Here, we formulate quantum link operation as a joint control problem over tunable rate-fidelity tradeoffs and uncontrollable link drift. From this framework, we construct a link control protocol that dynamically adapts source pump power and polarization compensation to maximize entanglement distribution rate subject to a minimum fidelity constraint. We evaluate the protocol through trace-driven simulations driven by data from a 64 km deployed optical fiber. Compared with optimized static policies, our adaptive controller improves mean entanglement distribution rate by 14% over a 24 hour trace, without requiring any offline policy optimization. Our results show that software-based physical layer control can provide a practical mechanism for improving near-term quantum link performance without requiring additional quantum hardware.
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BibTeX
@misc{clayton2026ratefidelity,
title = {{Rate-Fidelity Control for Wide-Area Quantum Links}},
author = {Connor Clayton and Cory Nunn and Quinn Carmack and Wayne McKenzie and Anne Marie Richards and Xiaodi Wu and Bobby Bhattacharjee},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2608.07163},
eprint = {2608.07163},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.07163},
}
RIS
TY - UNPB
TI - Rate-Fidelity Control for Wide-Area Quantum Links
AU - Connor Clayton
AU - Cory Nunn
AU - Quinn Carmack
AU - Wayne McKenzie
AU - Anne Marie Richards
AU - Xiaodi Wu
AU - Bobby Bhattacharjee
PY - 2026
DA - 2026/11/03
PB - arXiv
DO - 10.48550/arxiv.2608.07163
UR - https://arxiv.org/abs/2608.07163
AB - Quantum network links must distribute entanglement at high rates while satisfying application-specified fidelity demands. However, wide-area deployed fiber links suffer from polarization drift which destabilizes end-to-end fidelity and forces periodic compensation. Current deployments often use active stabilization with fixed control policies, and improvements generally stem from advances in quantum hardware. Meanwhile, software control remains relatively underexplored. Here, we formulate quantum link operation as a joint control problem over tunable rate-fidelity tradeoffs and uncontrollable link drift. From this framework, we construct a link control protocol that dynamically adapts source pump power and polarization compensation to maximize entanglement distribution rate subject to a minimum fidelity constraint. We evaluate the protocol through trace-driven simulations driven by data from a 64 km deployed optical fiber. Compared with optimized static policies, our adaptive controller improves mean entanglement distribution rate by 14% over a 24 hour trace, without requiring any offline policy optimization. Our results show that software-based physical layer control can provide a practical mechanism for improving near-term quantum link performance without requiring additional quantum hardware.
ER -