Constant modulation for enhancing QKD security

Details Constant modulation for enhancing QKD security Constant modulation for enhancing QKD security

2007-06-19

2007-06-19

Barrón, Jr., Gilberto (Department: 2132)

Cryptography

Key management

Key distribution

C359S281000

Reexamination Certificate

active

10970043

ABSTRACT:
A method of improving the security of a QKD system is disclosed. The QKD system exchanges qubits between QKD stations, wherein the brief period of time surrounding the expected arrival time of a qubit at a modulator in a QKD station defines a gating interval. The method includes randomly activating the modulator in a QKD station both within the gating interval and outside of the gating interval, while recording those modulations made during the gating interval. Such continuous or near-continuous modulation prevents an eavesdropper from assuming that the modulations correspond directly to the modulation of a qubit. Thus, an eavesdropper (Eve) has the additional and daunting task of determining which modulations correspond to actual qubit modulations before she can begin to extract any information from detected modulation states of the modulator.

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patent: 2 399 220 (2003-09-01), None
Gisin et al, “Quantum cryptography,” Rev. Mod. Phys. vol. 74 Jan. 2002 pp. 145-195.
Kutsiefer et al, “The breakdown flash of silicon avalanche photodiodes—backdoor for eavesdropper attacks?” arXiv: quant-ph/0104103 v1, Apr. 20, 2001.
Stucki et al., “Quantum key distribution over 67 km with a plug & play system,” New Journal of Physics, 4 (2002) 41.1-41.8 (Jul. 12, 2002).

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