6533b85dfe1ef96bd12bde48

RESEARCH PRODUCT

Dynamics of correlations due to a phase noisy laser

Giuseppe CompagnoBruno BellomoJames D. CresserErika AnderssonRosario Lo FrancoRosario Lo Franco

subject

Physics03.67.Mn Entanglement measures witnesses and other characterizationQuantum discordQuantum PhysicsPhase (waves)Markov processFOS: Physical sciencesQuantum entanglement03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox Bell's inequalities GHZ states etc.)Condensed Matter PhysicsAtomic and Molecular Physics and OpticsSettore FIS/03 - Fisica Della Materiasymbols.namesake02.50.Ga Markov processeQubit42.50.Dv Quantum state engineering and measurementsymbolsStatistical physicsExponential decayQuantum Physics (quant-ph)QuantumMathematical PhysicsLight field03.67.Lx Quantum computation architectures and implementations03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox Bell's inequalities GHZ states etc.); 42.50.Dv Quantum state engineering and measurements; 03.67.Mn Entanglement measures witnesses and other characterizations; 02.50.Ga Markov processes; 03.67.Lx Quantum computation architectures and implementations

description

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 of 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.

yearjournalcountryeditionlanguage
2012-02-17
https://dx.doi.org/10.48550/arxiv.1111.0917