Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/147178
Title: Optimal measurement preserving qubit channels
Authors: Kechrimparis, Spiros
Bae, Joonwoo
Keywords: Science::Physics
Issue Date: 2020
Source: Kechrimparis, S. & Bae, J. (2020). Optimal measurement preserving qubit channels. New Journal of Physics, 22(12). https://dx.doi.org/10.1088/1367-2630/abcc9b
Project: NRF-NRFF2016-02 
MOE2017-T1-002-043 
Journal: New Journal of Physics 
Abstract: We consider the problem of discriminating qubit states that are sent over a quantum channel and derive a necessary and sufficient condition for an optimal measurement to be preserved by the channel. We apply the result to the characterization of optimal measurement preserving (OMP) channels for a given qubit ensemble, e.g., a set of two states or a set of multiple qubit states with equal a priori probabilities. Conversely, we also characterize qubit ensembles for which a given channel is OMP, such as unitary and depolarization channels. Finally, we show how the sets of OMP channels for a given ensemble can be constructed.
URI: https://hdl.handle.net/10356/147178
ISSN: 1367-2630
DOI: 10.1088/1367-2630/abcc9b
Schools: School of Physical and Mathematical Sciences 
Rights: © 2020 The Author(s). Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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