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Experimental demonstration of time coding quantum key distribution
William Boucher, Thierry Debuisschert
Time coding quantum key distribution with coherent faint pulses is experimentally demonstrated. A measured 3.3 % quantum bit error rate and a relative contrast loss of 8.4 % allow…
Reduced randomness in quantum cryptography with sequences of qubits encoded in the same basis
L. -P. Lamoureux, H. Bechmann-Pasquinucci, N. J. Cerf +2
We consider the cloning of sequences of qubits prepared in the states used in the BB84 or 6-state quantum cryptography protocol, and show that the single-qubit fidelity is unaffect…
Quantum key distribution with trusted quantum relay
H. Bechmann-Pasquinucci, A. Pasquinucci
A trusted quantum relay is introduced to enable quantum key distribution links to form the basic legs in a quantum key distribution network. The idea is based on the well-known int…
Robustness of a quantum key distribution with two and three mutually unbiased bases
Filippo Caruso, Helle Bechmann-Pasquinucci, Chiara Macchiavello
We study the robustness of various protocols for quantum key distribution. We first consider the case of qutrits and study quantum protocols that employ two and three mutually unbi…
Eavesdropping without quantum memory
H. Bechmann-Pasquinucci
In quantum cryptography the optimal eavesdropping strategy requires that the eavesdropper uses quantum memories in order to optimize her information. What happens if the eavesdropp…
Impossibility of perfect quantum sealing of classical information
H. Bechmann-Pasquinucci, G. M. D'Ariano, C. Macchiavello
Sealing information means making it publicly available, but with the possibility of knowing if it has been read. Commenting on [1], we will show that perfect quantum sealing is not…