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Quantum key distribution without a single-photon source using a strong reference

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4 Author(s)
O. L. Guerreau ; Dept. Opt., GTL-CNRS Telecom, Metz, France ; F. J. Malassenet ; S. W. McLaughlin ; J. -M. Merolla

We present a single-sideband scheme that uses an enhanced BB84 protocol with a strong reference. A matrix method allows us to prove that this reference makes the system secure against the photon number splitting attack when using an imperfect laser source. The performance of a stable experimental setup with a fainted laser source is tested using an optimum average energy μ=1 photon per pulse to maximize the final key rate.

Published in:

IEEE Photonics Technology Letters  (Volume:17 ,  Issue: 8 )