On-chip detection and modulation for CV-QKD (Orale)

Yoann Piétri, Luis Trigo Vidarte, Matteo Schiavon +3 more

Mauro Persechino, Luis Trigo Vidarte, Mélissa Ziebell +6 more

Yuan Shen, Lushuai Cao, X. Y. Wang +9 more

An on-chip continuous-variable quantum key distribution(CV-QKD) system is integrated using silicon photonics fabrication process and demonstrates the capability of transceiving Gaussian-modulated coherent states and homodyne detection.

J. Konig, Ozan Çirkinoglu, Xaveer J. M. Leijtens

We report a monolithic CV-QKD transmitter chip, integrating laser, IQ modulator, and VOA. Key metrics include 120 kHz linewidth, > 8 GHz modulation, > 23 dB extinction, 56 dB SMSR, and 58 dB attenuation, meeting CV-QKD requirements.

Jaehyeok Han, Donghyeok Lee, Minseok Ryu +3 more

M. Facão, Vitor Ferreira, Alexandre Marques +2 more

Discretely modulated continuous-variables quantum key distribution (CV-QKD) protocols are usually proposed with phase modulated coherent states being sent by Alice and simple homodyne detection on the Bob side and, in the majority of the studies, their security is analyzed assuming that for low photon number the protocols are similar to a Gaussian modulated CV-QKD. Here we discuss other detection techniques such as double homodyne, consider classical attacks and find practical strategies for the legitimate parties to reach the security limits predicted by the Gaussian modulated CV-QKD.