Automated Polarization Basis Adjustment for Quantum Communication Protocols on Optical Fiber Networks

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F63839172%3A_____%2F24%3A10133667" target="_blank" >RIV/63839172:_____/24:10133667 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Automated Polarization Basis Adjustment for Quantum Communication Protocols on Optical Fiber Networks
Original language description
One of the primary challenges in the successful implementation of polarization-based QKD protocols over fiber networks are the unpredictable and time-varying unitary transformations induced by birefringence in single-mode fibers. We introduce an advanced method for automating polarization basis adjustments using motorized polarization controllers (MPCs). This approach employs scalar variables, termed coincidence entropies, to quantify the quality of polarization basis alignment. These entropies are aggregated into a single scalar variable, facilitating optimization via stochastic gradient descent. Our two-sided strategy characterizes coincidences as random events, with their distribution modifiable through MPCs. This approach remains effective even in scenarios with unbalanced optical powers, as a precisely defined set of weights, derived from single-photon counts, accounts for the varying efficiencies of the single-photon detectors.
Czech name
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Czech description
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Project
<a href="/en/project/LM2023054" target="_blank" >LM2023054: e-Infrastructure CZ</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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