Experimental study of the integration of continuous-variable quantum key distribution into a silicon photonics device

Mauro Persechino 1
1 Laboratoire Charles Fabry / Optique Quantique
LCF - Laboratoire Charles Fabry
Abstract : During recent years there have been significant developments in quantum cryptography, bringing quantum key distribution (QKD) devices on the market. This can be done by using either discrete variables (DV) and photon counting, or continuous variables (CV) and coherent detection. Current technological evolutions are now aiming at developing smaller, cheaper and more user-friendly devices.This work focuses on the implementation of CV-QKD using silicon photonics techniques, which provide a high degree of integration. This is exploited to build an on-chip realization of a cryptographic protocol, using Gaussian modulation of coherent states. Two different approaches have been used, first by physically implementing the sender (Alice) and the receiver (Bob) on the same chip for validation purposes, and then by having them onto two separate chips. The measured communication parameters give the possibility to extract a secret key
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Mauro Persechino. Experimental study of the integration of continuous-variable quantum key distribution into a silicon photonics device. Optics [physics.optics]. Université Paris-Saclay, 2017. English. ⟨NNT : 2017SACLO013⟩. ⟨tel-01759763⟩

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