Search results for "cavity-QED"

showing 3 items of 3 documents

Output Field-Quadrature Measurements and Squeezing in Ultrastrong Cavity-QED

2015

We study the squeezing of output quadratures of an electro-magnetic field escaping from a resonator coupled to a general quantum system with arbitrary interaction strengths. The generalized theoretical analysis of output squeezing proposed here is valid for all the interaction regimes of cavity-quantum electrodynamics: from the weak to the strong, ultrastrong, and deep coupling regimes. For coupling rates comparable or larger then the cavity resonance frequency, the standard input–output theory for optical cavities fails to calculate the variance of output field-quadratures and predicts a non-negligible amount of output squeezing, even if the system is in its ground state. Here we show that…

Cavity resonanceSettore FIS/02 - Fisica Teorica Modelli E Metodi MatematiciFOS: Physical sciencesGeneral Physics and AstronomyVirtual particlePhysics::Optics02 engineering and technologyUltrastrong Cavity-QED01 natural sciencesResonator0103 physical sciencesquadrature measurements; squeezing; ultrastrong cavity-QEDQuantum system010306 general physicsQuantumPhysicsQuantum PhysicsSpace QuantizationQuadrature Measurement021001 nanoscience & nanotechnologyQuadrature (astronomy)Quantum SystemSqueezingQuantum electrodynamicsCoupling RegimeComputingMethodologies_DOCUMENTANDTEXTPROCESSINGNoiseQuantum Physics (quant-ph)0210 nano-technologyGround stateQuadrature Measurements; Squeezing; Ultrastrong Cavity-QED; Space Quantization; Coupling Regime; Quantum System; Noise
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Atomic teleportation via cavity QED and position measurements: efficiency analysis

2008

We have recently presented a novel protocol to teleport an unknown atomic state via cavity QED and position measurements. Here, after a brief review of our scheme, we provide a quantitative study of its efficiency. This is accomplished by an explicit description of the measurement process that allows us to derive the fidelity with respect to the atomic internal state to be teleported.

Quantum opticsPhysicsTRANSLATIONAL DYNAMICSQuantum Physicsteleportation cavity-QEDProcess (computing)EXPERIMENTAL QUANTUM TELEPORTATIONGeneral Physics and AstronomyAtomic stateFOS: Physical sciencesQuantum PhysicsTeleportationPODOLSKY-ROSEN CHANNELSRABI OSCILLATIONSPosition (vector)Quantum mechanicsJAYNES-CUMMINGS MODELGeneral Materials ScienceState (computer science)Physics::Atomic PhysicsPhysical and Theoretical ChemistryQuantum Physics (quant-ph)Quantum teleportation
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Protecting entanglement by adjusting the velocities of moving qubits inside non-Markovian environments

2017

Efficient entanglement preservation in open quantum systems is a crucial scope towards a reliable exploitation of quantum resources. We address this issue by studying how two-qubit entanglement dynamically behaves when two atom qubits move inside two separated identical cavities. The moving qubits independently interact with their respective cavity. As a main general result, we find that under resonant qubit-cavity interaction the initial entanglement between two moving qubits remains closer to its initial value as time passes compared to the case of stationary qubits. In particular, we show that the initial entanglement can be strongly protected from decay by suitably adjusting the velocit…

Settore FIS/02 - Fisica Teorica Modelli E Metodi MatematiciPhysics and Astronomy (miscellaneous)Markov processFOS: Physical sciencesQuantum entanglement01 natural sciencesNoise (electronics)Settore FIS/03 - Fisica Della Materia010305 fluids & plasmassymbols.namesakeComputer Science::Emerging Technologies0103 physical sciencesInitial value problemStatistical physics010306 general physicsQuantumqubitInstrumentationPhysicsQuantum Physicsopen quantum systemAtom (order theory)Quantum Physicsnon-MarkovianityQubitScalabilitysymbolscavity-QEDentanglementQuantum Physics (quant-ph)
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