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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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
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 (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