Patent ID: 9652620
Date: 2017-05-16
CPC Classifications: G06F,H04L

Claim:
1. A quantum communication device comprising: a receiver configured to a sift processor configured to acquire sift processing data by referring to cryptographic key bit string in a predetermined bit string with a reference basis randomly selected from the plurality of bases; an estimator configured to acquire an estimated error rate by estimating an error rate of the sift processing data from an error rate of part of the sift processing data; a first storage configured to store the sift processing data and the estimated error rate in association with each other; a second storage configured to store difference data indicating a difference between a processing speed of error correcting processing of the sift processing data and a processing speed of privacy amplification processing of the sift processing data for each of error rates of a plurality of sift processing data; a determination unit configured to determine order of the sift processing data in which an error is to be corrected based on the estimated error rate and the difference data when a data volume of the sift processing data stored in the first storage is equal to or greater than a first threshold; a corrector configured to a measurement unit configured to measure the error rate of the sift processing data before correction by comparing the error correcting processing data with the sift processing data before the correction corresponding to the error correcting processing data; and a privacy amplifier configured to generate cryptographic key data based on the error rate measured by the measurement unit by applying the privacy amplification processing to the error correcting processing data.