Analysis of the effects of the two-photon temporal distinguishability on measurement-device-independent quantum key distribution (January 2023)

Measurement-device-independent quantum key distribution (MDI-QKD) protects legitimate users from attacks on measurement devices. The decoy method allows for unconditionally secure quantum key generation using lasers. One of the most important issues in MDI-QKD is that photons from two independent la...

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Bibliographic Details
Published in:IEEE transactions on quantum engineering 2023-01, Vol.4, p.1-8
Main Authors: Ge, H-B., Tomita, A., Okamoto, A., Ogawa, K.
Format: Article
Language:English
Subjects:
Decoy method
Delay effects
Error analysis
Fiber lasers
Hong-Ou-Mandel (HOM) interference
Hong-Ou-Mandel interference
Interference
Measurement-device-independent quantum key distribution
measurement-device-independent quantum key distribution (MDI-QKD)
Measuring instruments
Photonics
Photons
Protocols
Quantum cryptography
Quantum key distribution
Security
time delay
Time lag
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Summary:Measurement-device-independent quantum key distribution (MDI-QKD) protects legitimate users from attacks on measurement devices. The decoy method allows for unconditionally secure quantum key generation using lasers. One of the most important issues in MDI-QKD is that photons from two independent lasers must be indistinguishable. Because Alice and Bob send Charlie laser pulses through separate fiber links, the arrival times of the pulses fluctuate independently. According to the Hong-Ou-Mandel (HOM) interference at Charlie's relay, the time delay between two photons has the greatest effect on distinguishability. However, to date, these effects have not been analyzed. Our study uses simulations to investigate the effects of two-photon temporal distinguishability in terms of the visibility of the HOM-dip of two photons on the final key rate of finite-size MDI-QKD. Furthermore, an acceptable time delay range was estimated based on photons with Gaussian spectral amplitude functions.
ISSN:2689-1808
2689-1808
DOI:10.1109/TQE.2023.3259043