Tuesday, July 30, 2013

1307.7551 (Akshata Shenoy H. et al.)

Semi-counterfactual Quantum Cryptography    [PDF]

Akshata Shenoy H., R. Srikanth, T. Srinivas
In counterfactual quantum key distribution (QKD), two remote parties can securely share random polarization-encoded bits through the blocking rather than the transmission of particles. We propose a semi-counterfactual QKD, i.e., one where the secret bit is shared, and also encoded, based on the blocking or not blocking of a particle. As with other counterfactual schemes and the Goldenberg-Vaidman protocol, but unlike BB84, the encoding states are orthogonal and security arises from single-particle nonlocality. Unlike any of them, however, the secret bit generated is maximally indeterminate until the joint action of Alice and Bob. We prove the security of the protocol under a general incoherent attack, and study the most general photon-number preserving incoherent attack in detail.
View original: http://arxiv.org/abs/1307.7551

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