期刊
出版社
IEEE
DOI: 10.1109/WOLTE55422.2022.9882601
关键词
Quantum Key Distribution; single photons; Twin-Field QKD
资金
- European Union's Horizon 2020 research and innovation program [951886, 675662]
- European Union Horizon 2020 research and innovation program [EMPIR 19NRM06 METISQ]
- European Union - PON Ricerca e Innovazione 2014-2020 FESR/FSC [ARS01_00734 QUANCOM]
- [Nato-G5263]
The integration of QKD protocols in metropolitan networks requires addressing the challenges posed by unstable optical channels and background photons. Researchers have proposed an interferometry-based solution for precise channel length control and demonstrated its effectiveness.
The integration of Quantum Key Distribution (QKD) protocols in metropolitan networks, exploiting already deployed telecommunication fibers, requires particular attention due to the non-ideal environment in which the protocol operates. At present, Twin-field QKD is one of the most promising techniques to reach the extension of QKD transmission but its real-word exploitation requires that the communication channel is stable in terms of optical length and is free from background light that increase the errors in the transmitted keys. Adapting interferometry techniques derived from frequency metrology, we recently proposed a solution [1] for a tight channel length control, and demonstrated it on a 206 km metropolitan fiber with 65 dB loss. Here we analyze in details the effects of background photons and the solutions that we applied to reduce their contribution to a negligible level.
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