Search results for "Entanglement and quantum nonlocality"

showing 3 items of 3 documents

Two-qubit entanglement dynamics for two different non-Markovian environments

2009

We study the time behavior of entanglement between two noninteracting qubits each immersed in its own environment for two different non-Markovian conditions: a high-$Q$ cavity slightly off-resonant with the qubit transition frequency and a nonperfect photonic band-gap, respectively. We find that revivals and retardation of entanglement loss may occur by adjusting the cavity-qubit detuning, in the first case, while partial entanglement trapping occurs in non-ideal photonic-band gap.

03.67.Mn Entanglement measures witnesses and other characterizationCondensed Matter::Quantum GasesPhysicsQuantum Physicsbusiness.industryDynamics (mechanics)FOS: Physical sciencesMarkov process03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox Bell's inequalities GHZ states etc.)Quantum PhysicsTrappingQuantum entanglementCondensed Matter PhysicsAtomic and Molecular Physics and OpticsSettore FIS/03 - Fisica Della Materiasymbols.namesake03.67.Mn Entanglement measures witnesses and other characterizations; 03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox Bell's inequalities GHZ states etc.); 03.67.Lx Quantum computation architectures and implementationsQuantum mechanicsQubitsymbolsPhotonicsQuantum Physics (quant-ph)business03.67.Lx Quantum computation architectures and implementationsMathematical Physics
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Dynamics of correlations due to a phase noisy laser

2012

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-Markovia…

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
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Hierarchy and dynamics of trace distance correlations

2013

We define and analyze measures of correlations for bipartite states based on trace distance. For Bell diagonal states of two qubits, in addition to the known expression for quantum correlations using this metric, we provide analytic expressions for the classical and total correlations. The ensuing hierarchy of correlations based on trace distance is compared to the ones based on relative entropy and Hilbert-Schmidt norm. Although some common features can be found, the trace distance measure is shown to differentiate from the others in that the closest uncorrelated state to a given bipartite quantum state is not given by the product of the marginals, and further, the total correlations are s…

PhysicsQuantum PhysicsSettore FIS/02 - Fisica Teorica Modelli E Metodi MatematiciKullback–Leibler divergenceStatistical Mechanics (cond-mat.stat-mech)DiagonalGeneral Physics and AstronomyFOS: Physical sciencesProbability and statisticsMathematical Physics (math-ph)Entanglement measures witnesses and other characterizationQuantum stateQubitNorm (mathematics)Physics - Data Analysis Statistics and ProbabilityFoundations of quantum mechanicTrace distancemeasurement theoryStatistical physicsEntanglement and quantum nonlocalityQuantum Physics (quant-ph)QuantumCondensed Matter - Statistical MechanicsMathematical PhysicsData Analysis Statistics and Probability (physics.data-an)
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