Yoritoshi Adachi et al 2009 New J. Phys. 11 113033 doi:10.1088/1367-2630/11/11/113033
Boosting up quantum key distribution by learning statistics of practical single-photon sources
Yoritoshi Adachi1, Takashi Yamamoto, Masato Koashi and Nobuyuki Imoto
Show affiliationsWe propose a simple quantum-key-distribution (QKD) scheme for practical single-photon sources (SPSs), which works even with a moderate suppression of the second-order correlation g(2) of the source. The scheme utilizes a passive preparation of a decoy state by monitoring a fraction of the signal via an additional beam splitter and a detector at the sender's side to monitor photon-number splitting attacks. We show that the achievable distance increases with the precision with which the sub-Poissonian tendency is confirmed in higher photon-number distribution of the source, rather than with actual suppression of the multiphoton emission events. We present an example of the secure key generation rate in the case of a poor SPS with g(2)=0.19, in which no secure key is produced with the conventional QKD scheme, and show that learning the photon-number distribution up to several numbers is sufficient for achieving almost the same distance as that of an ideal SPS.
- PACS
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03.67.Dd Quantum cryptography and communication security
84.40.Ua Telecommunications: signal transmission and processing; communication satellites
- Subjects
- Dates
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Issue 11 (November 2009)
Received 27 August 2009
Published 17 November 2009
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Boosting up quantum key distribution by learning statistics of practical single-photon sources
Yoritoshi Adachi et al 2009 New J. Phys. 11 113033
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