A1 Refereed original research article in a scientific journal
Frozen discord in non-Markovian dephasing channels
Authors: Mazzola L, Piilo J, Maniscalco S
Publisher: WORLD SCIENTIFIC PUBL CO PTE LTD
Publication year: 2011
Journal: International Journal of Quantum Information
Journal name in source: INTERNATIONAL JOURNAL OF QUANTUM INFORMATION
Journal acronym: INT J QUANTUM INF
Number in series: 3
Volume: 9
Issue: 3
First page : 981
Last page: 991
Number of pages: 11
ISSN: 0219-7499
DOI: https://doi.org/10.1142/S021974991100754X
Self-archived copy’s web address: https://arxiv.org/abs/1006.1805
Abstract
We investigate the dynamics of quantum and classical correlations in a system of two qubits under local colored-noise dephasing channels. The time evolution of a single qubit interacting with its own environment is described by a memory kernel non-Markovian master equation. The memory effects of the non-Markovian reservoirs introduce new features in the dynamics of quantum and classical correlations compared to the white noise Markovian case. Depending on the geometry of the initial state, the system can exhibit frozen discord and multiple sudden transitions between classical and quantum decoherence [L. Mazzola, J. Piilo and S. Maniscalco, Phys. Rev. Lett. 104 (2010) 200401]. We provide a geometric interpretation of those phenomena in terms of the distance of the state under investigation to its closest classical state in the Hilbert space of the system.
We investigate the dynamics of quantum and classical correlations in a system of two qubits under local colored-noise dephasing channels. The time evolution of a single qubit interacting with its own environment is described by a memory kernel non-Markovian master equation. The memory effects of the non-Markovian reservoirs introduce new features in the dynamics of quantum and classical correlations compared to the white noise Markovian case. Depending on the geometry of the initial state, the system can exhibit frozen discord and multiple sudden transitions between classical and quantum decoherence [L. Mazzola, J. Piilo and S. Maniscalco, Phys. Rev. Lett. 104 (2010) 200401]. We provide a geometric interpretation of those phenomena in terms of the distance of the state under investigation to its closest classical state in the Hilbert space of the system.
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