Parameter estimation and control in a QKD link

Oleksiy Pikalo; John Schlafer; Alex Colvin; Brig B. Elliott

doi:10.1117/12.541811

24 August 2004 Parameter estimation and control in a QKD link

Oleksiy Pikalo, John Schlafer, Alex Colvin, Brig B. Elliott

Proceedings Volume 5436, Quantum Information and Computation II; (2004) https://doi.org/10.1117/12.541811
Event: Defense and Security, 2004, Orlando, Florida, United States

Abstract

We describe a technique of parameter estimation and control in a phase-encoded quantum key distribution that uses continuous control of receiver-interferometer differential path length to maintain alignment with the transmitter. In this fiber-based system, a small number of training frames are sent over the quantum channel allowing the receiver to compensate for drift in the transmitter and receiver interferometers due to slow changes in temperature. The minimum mean-square error estimation method used to infer the state of the system incorporates the prior knowledge of the fiber dynamics recursively. The optimal linear-quadratic regulator feedback design is described and combined with the estimator to obtain the stochastic linear regulator of the path-length error.

Citation Download Citation

Oleksiy Pikalo, John Schlafer, Alex Colvin, and Brig B. Elliott "Parameter estimation and control in a QKD link", Proc. SPIE 5436, Quantum Information and Computation II, (24 August 2004); https://doi.org/10.1117/12.541811

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