Abstract: A quantum key distribution method according to the present invention includes an error probability estimation step of estimating error probabilities of transmission data and the received data, an error correcting step of correcting errors in the received data based on error correcting information, a matching determination step of determining whether the transmission data and the received data after correcting errors match, and an information amount estimating step of estimating an amount of information leaked to an adversary through a quantum communication path, and further compresses data based on the amount of information made public in a process of processing via a public communication path and an estimated value of the amount of information leaked to the adversary through the quantum communication path to make the data after compression a cryptographic key shaped by devices.

Abstract: A method of distributing a quantum key through a quantum communication path includes: a transmitting device and a receiving device generating a parity check matrix separately; the transmitting device notifying the receiving device of error correction information generated based on the parity check matrix and transmission data, through a public communication path; the receiving device correcting an error in reception data based on the error correction information. The above processing is repeatedly executed until the error is successfully corrected.

Abstract: A method of distributing a quantum key through a quantum communication path includes: a transmitting device and a receiving device generating a parity check matrix separately; the transmitting device notifying the receiving device of error correction information generated based on the parity check matrix and transmission data, through a public communication path; the receiving device correcting an error in reception data based on the error correction information. The above processing is repeatedly executed until the error is successfully corrected.