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Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection

Qi, Bing ; Lougovski, Pavel ; Pooser, Raphael ; Grice, Warren ; Bobrek, Miljko

Physical review. X, 2015-10, Vol.5 (4), p.041009, Article 041009 [Periódico revisado por pares]

College Park: American Physical Society

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Título:
Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection
Autor: Qi, Bing ; Lougovski, Pavel ; Pooser, Raphael ; Grice, Warren ; Bobrek, Miljko
Assuntos: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ; Coherence ; Communication ; Communications systems ; Continuity (mathematics) ; Data recovery ; Drift ; Lasers ; Light sources ; MATHEMATICS AND COMPUTING ; Noise ; Noise threshold ; Optical fibers ; optics ; Quantum cryptography ; Quantum encryption ; quantum information ; Quantum mechanics ; Security ; Selectivity
É parte de: Physical review. X, 2015-10, Vol.5 (4), p.041009, Article 041009
Notas: USDOE
AC05-00OR22725
Descrição: Continuous-variable quantum key distribution (CV-QKD) protocols based on coherent detection have been studied extensively in both theory and experiment. In all the existing implementations of CV-QKD, both the quantum signal and the local oscillator (LO) are generated from the same laser and propagate through the insecure quantum channel. This arrangement may open security loopholes and limit the potential applications of CV-QKD. In this paper, we propose and demonstrate a pilot-aided feedforward data recovery scheme that enables reliable coherent detection using a “locally” generated LO. Using two independent commercial laser sources and a spool of 25-km optical fiber, we construct a coherent communication system. The variance of the phase noise introduced by the proposed scheme is measured to be 0.04 (rad2 ), which is small enough to enable secure key distribution. This technology also opens the door for other quantum communication protocols, such as the recently proposed measurement-device-independent CV-QKD, where independent light sources are employed by different users.
Editor: College Park: American Physical Society
Idioma: Inglês

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Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection

Qi, Bing ; Lougovski, Pavel ; Pooser, Raphael ; Grice, Warren ; Bobrek, Miljko

College Park: American Physical Society

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