156 citations · 744 across the 34 of their papers we have counts for
34 papers
Strong convergence of a resolution of the identity via canonical coherent states
Ryo Namiki
A resolution of the identity due to canonical coherent states is often proven in the weak operator topology. However, such a resolution with an integral symbol is typically suppose…
Security against collective attacks for a continuous-variable quantum key distribution protocol using homodyne detection and postselection
Ryo Namiki
We analyze the security against collective attacks for a homodyne-based continuous-variable quantum key distribution protocol using binary coherent states and postselection. We der…
Majorization relations for a set of two-mode squeezed number states
Ryo Namiki
Two-mode squeezed number states (TMSNS) are natural generalization of two-mode squeezed vacuum states. It has been known that every TMSNS is entangled whenever the squeezing parame…
Secret key rate of a continuous-variable quantum-key-distribution scheme when the detection process is inaccessible to eavesdroppers
Ryo Namiki, Akira Kitagawa, Takuya Hirano
We have developed a method to calculate a secret key rate of a continuous-variable quantum-key-distribution scheme using four coherent states and postselection for a general model…
Coexistence of Continuous Variable Quantum Key Distribution and 7 12.5 Gbit/s Classical Channels
Tobias A. Eriksson, Takuya Hirano, Motoharu Ono +6
We study coexistence of CV-QKD and 7 classical 12.5 Gbit/s on-off keying channels in WDM transmission over the C-band. We demonstrate key generation with a distilled secret key rat…
Bayesian uncertainty relation for a joint measurement of canonical variables
Ryo Namiki
We present a joint-measurement uncertainty relation for a pair of mean square deviations of canonical variables averaged over Gaussian distributed quantum optical states. Our Bayes…