Two-time state formalism for quantum eavesdropping

Flatt, K., Croke, S. and Barnett, S. M. (2018) Two-time state formalism for quantum eavesdropping. Physical Review A: Atomic, Molecular and Optical Physics, 98, 052339. (doi:10.1103/PhysRevA.98.052339)

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Abstract

The key piece of knowledge which quantum eavesdroppers can access is the correlation between prior and future events, i.e., the postselected results of the legitimate preparations and measurements. We present a method for optimizing eavesdropping strategies which is closely related to the two-time state formalism, the natural way to analyze such scenarios; it converts the task of optimization into an eigenvalue problem. Our framework is applied to the familiar BB84 and B92 protocols as well as to the largely unexplored three-state scheme, which has a remarkable feature: the best eavesdropping strategy does not extract any information about the sent state.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Barnett, Professor Stephen and Flatt, Kieran and Croke, Dr Sarah
Authors: Flatt, K., Croke, S., and Barnett, S. M.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review A: Atomic, Molecular and Optical Physics
Publisher:American Physical Society
ISSN:1050-2947
ISSN (Online):1094-1622
Copyright Holders:Copyright © 2018 The American Physical Society
First Published:First published in Physical Review A: Atomic, Molecular and Optical Physics 98:052339
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
721291Astronomy and physics, theoretical physics and application physics / Quantum Theory. Royal Society Research Professorship.Stephen BarnettThe Royal Society (ROYSOC)RP150122S&E P&A - PHYSICS & ASTRONOMY