We analyze the dynamics of various kinds of correlations present between two initially entangled independent qubits, each one subject to a local phase-noisy laser. We give explicit expressions for the relevant quantifiers of correlations for the general case of single-qubit unital evolution, which includes the case of a phase-noisy laser. Although the light field is treated as classical, we find that this model can describe revivals of quantum correlations. Two different dynamical regimes of decay of correlations occur, a Markovian one (exponential decay) and a non-Markovian one (oscillatory decay with revivals) depending on the values of system parameters. In particular, in the non-Markovian regime, quantum correlations quantified by quantum discord show an oscillatory decay faster than that of classical correlations. Moreover, there are time regions where nonzero discord is present while entanglement is zero.

Bellomo, B., Lo Franco, R., Andersson, E., Cresser, J.D., Compagno G (2012). Dynamics of correlations due to a phase noisy laser. PHYSICA SCRIPTA, 2012(T147), 014004 [10.1088/0031-8949/2012/T147/014004].

Dynamics of correlations due to a phase noisy laser

BELLOMO, Bruno;LO FRANCO, Rosario;COMPAGNO, Giuseppe
2012-01-01

Abstract

We analyze the dynamics of various kinds of correlations present between two initially entangled independent qubits, each one subject to a local phase-noisy laser. We give explicit expressions for the relevant quantifiers of correlations for the general case of single-qubit unital evolution, which includes the case of a phase-noisy laser. Although the light field is treated as classical, we find that this model can describe revivals of quantum correlations. Two different dynamical regimes of decay of correlations occur, a Markovian one (exponential decay) and a non-Markovian one (oscillatory decay with revivals) depending on the values of system parameters. In particular, in the non-Markovian regime, quantum correlations quantified by quantum discord show an oscillatory decay faster than that of classical correlations. Moreover, there are time regions where nonzero discord is present while entanglement is zero.
Settore FIS/03 - Fisica Della Materia
http://iopscience.iop.org/1402-4896/2012/T147/014004;jsessionid=65093FB5A35F37097BD659311D1F2F09.c1
Bellomo, B., Lo Franco, R., Andersson, E., Cresser, J.D., Compagno G (2012). Dynamics of correlations due to a phase noisy laser. PHYSICA SCRIPTA, 2012(T147), 014004 [10.1088/0031-8949/2012/T147/014004].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/66596
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