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Frozen discord in non-Markovian dephasing channels
Tekijät: Mazzola L, Piilo J, Maniscalco S
Kustantaja: WORLD SCIENTIFIC PUBL CO PTE LTD
Julkaisuvuosi: 2011
Journal: International Journal of Quantum Information
Tietokannassa oleva lehden nimi: INTERNATIONAL JOURNAL OF QUANTUM INFORMATION
Lehden akronyymi: INT J QUANTUM INF
Numero sarjassa: 3
Vuosikerta: 9
Numero: 3
Aloitussivu: 981
Lopetussivu: 991
Sivujen määrä: 11
ISSN: 0219-7499
DOI: https://doi.org/10.1142/S021974991100754X
Rinnakkaistallenteen osoite: https://arxiv.org/abs/1006.1805
Tiivistelmä
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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