Search results for "quantum state engineering and measurement"

showing 2 items of 2 documents

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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GHZ state generation of three Josephson qubits in the presence of bosonic baths

2013

We analyze an entangling protocol to generate tripartite Greenberger-Horne-Zeilinger states in a system consisting of three superconducting qubits with pairwise coupling. The dynamics of the open quantum system is investigated by taking into account the interaction of each qubit with an independent bosonic bath with an ohmic spectral structure. To this end a microscopic master equation is constructed and exactly solved. We find that the protocol here discussed is stable against decoherence and dissipation due to the presence of the external baths.

Quantum decoherencequantum statistical methodFOS: Physical sciencesQuantum entanglement01 natural sciences010305 fluids & plasmasSuperconductivity (cond-mat.supr-con)quantum fluctuations quantum noise quantum jumpQuantum nonlocalityOpen quantum systemQuantum mechanics0103 physical sciencesMaster equationdecoherence010306 general physicsSuperconductivityPhysicsQuantum PhysicsCondensed Matter - Superconductivityquantum nonlocalityQuantum PhysicsCondensed Matter PhysicsAtomic and Molecular Physics and OpticsGreenberger–Horne–Zeilinger stateQubitopen systemQuantum Physics (quant-ph)entanglementquantum state engineering and measurementJournal of Physics B: Atomic, Molecular and Optical Physics
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