Secure Key Rate of the BB84 Protocol using Finite Sample Bits

Kenta Sakakibara, 隆太郎 松本, Ryutaroh Matsumoto +2 more

Hong-Yi Su

Yousuke Sano, Ryutaroh Matsumoto, Tomohiko Uyematsu

We improve the non-asymptotic key rate shown by Scarani and Renner by proposing several methods to construct tighter conservative confidence interval of the phase error rate than the one shown by them. In addition, we show that the accurate channel estimation method non-asymptotically increases the key rate over the amplitude damping channel as well as the asymptotic case in the BB84 protocol.

Vivek Jain, Siddhanth Naik, Sagar Harsora +2 more

Yousuke Sano, Ryutaroh Matsumoto, Tomohiko Uyematsu

We improve the non-asymptotic key rate shown by Scarani and Renner by proposing several methods to construct tighter conservative confidence intervals of the phase error rate than one previously shown.In addition, we show that the accurate channel estimation method non-asymptotically increases the key rate over the amplitude damping channel as well as the asymptotic case in the BB84 protocol.

Alharith A. Abdullah, Yasser H Jassem