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Title: Global asymmetry of many-qubit correlations: A lattice-gauge-theory approach
Authors: Williamson, M.S. 
Ericsson, M.
Johansson, M.
Sjöqvist, E.
Sudbery, A.
Vedral, V. 
Issue Date: 2-Sep-2011
Citation: Williamson, M.S., Ericsson, M., Johansson, M., Sjöqvist, E., Sudbery, A., Vedral, V. (2011-09-02). Global asymmetry of many-qubit correlations: A lattice-gauge-theory approach. Physical Review A - Atomic, Molecular, and Optical Physics 84 (3) : -. ScholarBank@NUS Repository.
Abstract: We introduce a bridge between the familiar gauge field theory approaches used in many areas of modern physics such as quantum field theory and the stochastic local operations and classical communication protocols familiar in quantum information. Although the mathematical methods are the same, the meaning of the gauge group is different. The measure we introduce, "twist," is constructed as a Wilson loop from a correlation-induced holonomy. The measure can be understood as the global asymmetry of the bipartite correlations in a loop of three or more qubits; if the holonomy is trivial (the identity matrix), the bipartite correlations can be globally untwisted using general local qubit operations, the gauge group of our theory, which turns out to be the group of Lorentz transformations familiar from special relativity. If it is not possible to globally untwist the bipartite correlations in a state using local operations, the twistedness is given by a nontrivial element of the Lorentz group, the correlation-induced holonomy. We provide several analytical examples of twisted and untwisted states for three qubits, the most elementary nontrivial loop one can imagine. © 2011 American Physical Society.
Source Title: Physical Review A - Atomic, Molecular, and Optical Physics
ISSN: 10502947
DOI: 10.1103/PhysRevA.84.032302
Appears in Collections:Staff Publications

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