Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/5930
Title: Semi-counterfactual cryptography
Authors: Shenoy, Akshata H.
Srikanth, R.
Srinivas, T.
Issue Date: Sep-2013
Publisher: IOP Publishing Ltd.
Citation: Europhysics Letters, 2013, Vol. 103, p. 60008
Abstract: 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 non-blocking of a particle. The scheme is thus semi-counterfactual and not based on polarization encoding. As with other counterfactual schemes and the Goldenberg-Vaidman protocol, but unlike BB84, the encoding states are orthogonal and security arises ultimately from single-particle non-locality. Unlike any of them, however, the secret bit generated is maximally indeterminate until the joint action of Alice and Bob. We prove the general security of the protocol, and study the most general photon-number–preserving incoherent attack in detail.
Description: Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI: http://hdl.handle.net/2289/5930
ISSN: 0295-5075
1286-4854 (Online).
Alternative Location: http://arxiv.org/abs/1307.7551
http://dx.doi.org/10.1209/0295-5075/103/60008
Copyright: 2013 EPLA
Appears in Collections:Research Papers (LAMP)

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