Quantum key delivery method and communication device
AssigneesMitsubishi Denki Kabushiki Kaisha, Riken
InventorsWataru Matsumoto, Yodai Watanabe
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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.
Claims6
A method of distributing a quantum key from a transmitting device to a receiving device by adopting, as the quantum key, a result of estimating transmission data by correcting an error in reception data with probability information obtained by measuring photons on a quantum communication path, the method comprising:
- first generating including the transmitting device and the receiving device generating a first parity-check matrix separately;
- first notifying including the transmitting device notifying the receiving device of first error-correction information generated based on the first parity-check matrix and transmission data, through a public communication path;
- first correcting including the receiving device correcting an error in reception data based on the first error-correction information;
- second generating including the transmitting device and the receiving device generating, when the error in the reception data is not successfully corrected, second parity-check matrix separately so that a second error-correction information generated based on the second parity-check matrix and the transmission data includes the first error-correction information;
- second notifying including the transmitting device notifying the receiving device of the second error-correction information through the public communication path;
- second correcting including the receiving device correcting an error in the reception data based on the first error-correction information and the second error-correction information;
- and
- disposing including the transmitting device and the receiving device disposing, when the error in the reception data is successfully corrected, a part of the transmission data and a part of the reception data with the error corrected, respectively, according to an amount of the first error-correction information or the second error-correction information.
A receiving device that receives a quantum key from a transmitting device by adopting, as the quantum key, a result of estimating transmission data by correcting an error in reception data with probability information obtained by measuring photons on a quantum communication path, the receiving device comprising:
- a first decoding unit that generates a first parity-check matrix that is identical with a first parity-check matrix generated by the transmitting device, and corrects an error in reception data based on a first error-correction information that is generated by the transmitting device based on the first parity-check matrix and transmission data and transmitted from the transmitting device through a public communication path;
- a second decoding unit that generates, when the error in the reception data is not successfully corrected, a second parity-check matrix that is identical with a second parity-check matrix generated by the transmitting device so that a second error-correction information generated based on the second parity-check matrix and the transmission data includes the first error-correction information, and corrects the error in the reception data based on the first error-correction information and the second error-correction information;
- and
- a disposing unit that disposes, when the error in the reception data is successfully corrected, a part of the reception data with the error corrected according to an amount of the first error-correction information or the second error-correction information.
A transmitting device that transmits a quantum key to a receiving device that adopts, as the quantum key, a result of estimating transmission data by correcting an error in reception data with probability information obtained by measuring photons on a quantum communication path, the transmitting device comprising:
- a first-error-correction-information-generating unit that generates first error-correction information based on a first parity-check matrix generated in advance and transmission data, and notifies the receiving device of the first error-correction information through a public communication path;
- a second-error-correction-information-generating unit that generates, when an error in reception data is not successfully corrected by the receiving device, generates a second parity-check matrix so that a second error-correction information generated based on the second parity-check matrix and the transmission data includes the first error-correction information, and notifies the receiving device of the second error-correction information through the public communication path;
- and
- an encryption key generating unit that disposes, when the error in the reception data is successfully corrected, a part of the transmission data according to an amount of the first error-correction information and the second error-correction information.
Dependencies are inferred from the claim text.