Decoy-state quantum key distribution over 227 km with a frequency-converted telecom single-photon source

• URL: http://arxiv.org/abs/2512.05101v1
• Date: Thu, 04 Dec 2025 18:59:03 GMT
• Title: Decoy-state quantum key distribution over 227 km with a frequency-converted telecom single-photon source
• Authors: Frederik Brooke Barnes, Roberto G. Pousa, Christopher L. Morrison, Zhe Xian Koong, Joseph Ho, Francesco Graffitti, John Jeffers, Daniel K. L. Oi, Brian D. Gerardot, Alessandro Fedrizzi,
• Abstract summary: We implement a decoy-state quantum key distribution scheme using a telecom C-band single- emitter source.<n>We demonstrate positive secret key rates using our scheme over 227 km of optical fiber, equivalent to a loss tolerance one order of magnitude greater than non-decoy schemes.
• Score: 30.714641171576844
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We implement a decoy-state quantum key distribution scheme using a telecom C-band single- emitter source. The decoy states are created by varying the optical excitation of the quantum emitter to modulate the photon number distribution. We provide an analysis of our scheme based on existing security proofs, allowing the calculation of secret key rates including finite key effects. This enables us to demonstrate, with a realistic single-photon source, positive secret key rates using our scheme over 227 km of optical fiber, equivalent to a loss tolerance one order of magnitude greater than non-decoy schemes. This work broadens the scope of single-photon sources in future quantum networks by enabling long-distance QKD with realistic levels of single-photon purity.

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