Communication device, quantum key distribution system, quantum key distribution method, and computer program product
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United States of America Patent
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Jul 2, 2019
Grant Date -
Sep 14, 2017
app pub date -
Dec 19, 2016
filing date -
Mar 14, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
According to an embodiment, a communication device is connected with another communication device through a quantum communication channel with a shared encryption key. The device includes a communication unit, a sifter, a corrector, a calculator, and an extractor. The communication unit is configured to acquire a sequence of photons through the quantum communication channel and acquire a photon bit string corresponding to the sequence of photons. The sifter is configured to generate a shared bit string from the photon bit string by sifting processing using basis information. The corrector is configured to generate a corrected bit string by correcting an error included in the shared bit string. The calculator is configured to generate a hash-calculated bit string by performing hash calculation on the corrected bit string. The extractor is configured to extract, as the key, from the hash-calculated bit string, a bit string having the length of the key.
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