Dynamics of correlations due to a phase noisy laser

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 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.

7 pages, 3 figures, accepted for publication in Phys. Scripta, special issue for CEWQO 2011 proceedings

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• Finite-Time Disentanglement via Spontaneous Emission
• Non-Markovian effects on the dynamics of entanglement
• Entanglement dynamics of two independent qubits in environments with and without memory
• Sudden death and sudden birth of entanglement in common structured reservoirs
• Finding the Kraus decomposition from a master equation and vice versa

Cited by in corpus (15)

• Dynamics of quantum correlations in two-qubit systems within non-Markovian environments
• Recovering Entanglement by Local Operations
• Hierarchy and dynamics of trace distance correlations
• Distributed correlations and information flows within a hybrid multipartite quantum-classical system
• Protecting entanglement by adjusting the velocities of moving qubits inside non-Markovian environments
• Stationary three-dimensional entanglement via dissipative Rydberg pumping
• Relations between entanglement and purity in non-Markovian dynamics
• Comparison of non-Markovianity criteria in a qubit system under random external fields
• Overview on the phenomenon of two-qubit entanglement revivals in classical environments
• Dynamics of spatially indistinguishable particles and entanglement protection
• Entanglement robustness via spatial deformation of identical particle wave functions
• Indistinguishability-enhanced entanglement recovery by spatially localized operations and classical communication
• Searching for exceptional points and inspecting non-contractivity of trace distance in (anti-)$\mathcal{P}\mathcal{T}-$symmetric systems
• Coherent control of dissipative dynamics in a periodically driven lattice array
• Witnessing random unitary and projective quantum channels: Complementarity between separable and maximally entangled states