Robustness of Quantum Cryptography Systems with Phase–Time Coding against Active Probing Attacks

The robustness of a quantum cryptography system is considered that uses a protocol with phase–time coding on attenuated coherent states. This protocol admits an effective fiber optic implementation, which does not require a phase modulator on the receiver side and adjusting the polarization state at...

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Bibliographic Details
Published in:Journal of experimental and theoretical physics 2020-12, Vol.131 (6), p.877-894
Main Author: Molotkov, S. N.
Format: Article
Language:English
Subjects:
Atoms
Channels
Classical and Quantum Gravitation
Coding
Communications equipment
Comparative analysis
Cryptography
Elementary Particles
Equipment and supplies
Fiber optics
Investigations
Leakage
Molecules
Optics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Quantum cryptography
Quantum Field Theory
Receiving
Relativity Theory
Robustness
Solid State Physics
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Summary:The robustness of a quantum cryptography system is considered that uses a protocol with phase–time coding on attenuated coherent states. This protocol admits an effective fiber optic implementation, which does not require a phase modulator on the receiver side and adjusting the polarization state at the input of the receiver side. The absence of a phase modulator on the receiver side excludes a side channel of information leakage associated with the active probing of the phase modulator at the receiving station, thus making the system more robust against such attacks compared to other systems. The nonstrict single-photon nature of information states, as well as information leakage through side channels, is considered by the generalized decoy state method, which takes into account joint collective measurements of information quantum states and quantum states in side channels. An estimate for the secret key length is obtained that is expressed only in terms of observed quantities at the receiving station and the parameters of quantum states in side channels.
ISSN:1063-7761
1090-6509
DOI:10.1134/S1063776120110138