Noise Tolerance of the BB84 Protocol with Random Privacy Amplification

峻 渡辺, Shun N. Watanabe, 隆太郎 松本 +3 more

友彦 植松, TOMOHIKO UYEMATSU

Shun Watanabe, Ryutaroh Matsumoto, R. Uyematsu

This paper shows that the BB84 protocol with random privacy amplification is secure with a higher key rate than Mayers' estimate with the same error rate. Consequently, the tolerable error rate of this protocol is increased from 7.5% to 11%. We also extend this method to the case of estimating error rates separately in each basis, which enables us to securely share a longer key.

Mihai-Zicu Mina, Emil Simion

Shun Watanabe, Ryutaroh Matsumoto, Tomohiko Uyematsu

This paper shows that the random privacy amplification is secure with a higher key rate than Mayers' evaluation at the same error rate in the BB84 protocol with one-way or two-way classical communications. There exists only Mayers' evaluation on the secure key rate with random privacy amplification that is applicable to the BB84 protocol with two-way classical communications. Our result improves the secure key rate of the random privacy amplification in the BB84 protocol with two-way classical communications.

Vani Jayasri Geddada, P. Lakshmi