Minimal noise subsystems
Name
PhysRevLett.116.090404.pdf
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323.44 KB
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Adobe PDF
Checksum (MD5)
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Author(s)
Wang, Xiaoting
Byrd, Mark
Jacobs, Kurt
Date Issued
March 2016
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Wang, Xiaoting, Mark Byrd, and Kurt Jacobs. “Minimal Noise Subsystems.” Physical Review Letters 116, no. 9 (March 3, 2016). © 2016 American Physical Society
Version
Final published version
Abstract
A system subjected to noise contains a decoherence-free subspace or subsystem (DFS) only if the noise possesses an exact symmetry. Here we consider noise models in which a perturbation breaks a symmetry of the noise, so that if S is a DFS under a given noise process it is no longer so under the new perturbed noise process. We ask whether there is a subspace or subsystem that is more robust to the perturbed noise than S. To answer this question we develop a numerical method that allows us to search for subspaces or subsystems that are maximally robust to arbitrary noise processes. We apply this method to a number of examples, and find that a subsystem that is a DFS is often not the subsystem that experiences minimal noise when the symmetry of the noise is broken by a perturbation. We discuss which classes of noise have this property.
MIT Department
Massachusetts Institute of Technology. Research Laboratory of Electronics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.116.090404
