| 摘要 |
A quantum key delivering method in which an error in received data is corrected by a check matrix for the determinate stable-characteristic "Irregular-LDPC code", and a part of shared information is discarded according to opened error correction information. Another mode of quantum key delivering method in which while lowering the code rate until the errors in the received data are perfectly corrected, a parity check matrix corresponding to a specific code rate is extracted from the parity check matrices optimized at code rates in a desired range, an additional syndrome is generated, and an error correction processing is repeated using the additional syndrome.
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