Quantum and classical thermal correlations in the XY spin-(1/2) chain
By J. Maziero, H. Guzmán, Lucas C. Céleri, Marcelo S. Sarandy, R. Serra. 2010
178 citations recorded by the source corpus.
We investigate pairwise quantum correlation as measured by the quantum discord as well as its classical counterpart in the thermodynamic limit of anisotropic XY spin-1/2 chains in a transverse magnetic field for both zero and finite temperatures. Analytical expressions for both classical and quantum correlations are obtained for spin pairs at any distance. In the case of zero temperature, it is shown that the quantum discord for spin pairs farther than second neighbors is able to characterize a quantum phase transition, even though pairwise entanglement is absent for such distances. For finite temperatures, we show that quantum correlations can be increased with temperature in the presence of a magnetic field. Moreover, in the XX limit, thermal quantum discord is found to be dominant over classical correlation while the opposite scenario takes place for the transverse field Ising model limit.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/4a105ac4af01b063c0ebc84e15c005137e66b471
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In Artificial Intelligence
In Atomic and Molecular Physics, and Optics
Citations in the corpus
- The classical-quantum boundary for correlations: Discord and related measures (2011, methodology): “(Maziero et al., 2010c) take a model of two noninteracting qubits subject to independent noise channels, and consider the evolution and transfer of classical and quantum correlations across different partitions of the system (intra-system, system-environment, and environment-environment).”