Intensity correlations in cavity QED

Foster, G. T.; Mielke, S. L.; Orozco, L. A.

doi:10.1103/physreva.61.053821

Cited by 71 publications

(118 citation statements)

References 29 publications

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“…A number of optical studies, experimental and theoretical, have focused on the non-classical features as observed in the intensity correlations, eg. photon antibunching [13][14][15][16]. Our recent observations look, however, at the time dependence of the conditional fluctuations of the field [2] and its connection with the spectrum of squeezing.…”

Section: Introductionmentioning

confidence: 99%

Time evolution and squeezing of the field amplitude in cavity QED

et al. 2001

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We present the conditional time evolution of the electromagnetic field produced by a cavity QED system in the strongly coupled regime. We obtain the conditional evolution through a wave-particle correlation function that measures the time evolution of the field after the detection of a photon. A connection exists between this correlation function and the spectrum of squeezing which permits the study of squeezed states in the time domain. We calculate the spectrum of squeezing from the master equation for the reduced density matrix using both the quantum regression theorem and quantum trajectories. Our calculations not only show that spontaneous emission degrades the squeezing signal, but they also point to the dynamical processes that cause this degradation.

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Section: Introductionmentioning

confidence: 99%

Time evolution and squeezing of the field amplitude in cavity QED

et al. 2001

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“…corresponding to the phenomenon of anti-bunching [10][11][12][13] which is associated with a single photon. …”

Section: Examplesmentioning

confidence: 99%

Intensity–intensity correlations determined by dimension of quantum state in phase space:P-distribution

2015

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We use the P-distribution to show that the familiar values 1, 2 and 3 of the normalized second order correlation function at equal times g 0 2 ( ) ( ) corresponding to a coherent state, a thermal state and a highly squeezed vacuum are a consequence of the number of dimensions these states take up in quantum phase space. Whereas the thermal state exhibits rotational symmetry and thus extends over two dimensions, the squeezed vacuum factorizes into two independent onedimensional phase space variables, and in the limit of large squeezing is therefore a onedimensional object. The coherent state is a point in the phase space of the P-distribution and thus has zero dimensions. The fact that for photon number states the P-distribution is even narrower than that of the zero-dimensional coherent state suggests the notion of 'negative' dimensions.

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“…The coherence function g (2) (τ ) is a function of Ωτ = (τ /t)r, α, ξ, andn, where the preparation time t is the time that it takes the system to dynamically generate the Gaussian densityρ G given by (11) from the initial thermal stateρ 0 given by (9). Now…”

Section: Temporal Second-order Correlation Functionmentioning

confidence: 99%

“…Measurements of the normalized, second-order intensity correlation function for a stationary process of light emitted from a cavity QED system composed of N , two-level atoms coupled to a single mode of the electromagnetic field has been shown to exhibit the nonclassical features and dynamics of the atom-field interaction [9]. This paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Temporal second-order coherence function for displaced-squeezed thermal states

Alexanian

2015

Journal of Modern Optics

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We calculate the quantum mechanical, temporal second-order coherence function for a singlemode, degenerate parametric amplifier for a system in the Gaussian state, viz., a displaced-squeezed thermal state. The calculation involves first the dynamical generation at time t of the Gaussian state from an initial thermal state and subsequent measurements of two photons a time τ ≥ 0 apart. The generation of the Gaussian state by the parametric amplifier ensures that the temporal second-order coherence function depends only on τ , via τ /t, for given Gaussian state parameters, Gaussian state preparation time t, and average numbern of thermal photons. It is interesting that the time evolution for displaced thermal states shows a power decay in τ /t rather than an exponential one as is the case for general, displaced-squeezed thermal states.

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Intensity correlations in cavity QED

Cited by 71 publications

References 29 publications

Time evolution and squeezing of the field amplitude in cavity QED

Time evolution and squeezing of the field amplitude in cavity QED

Intensity–intensity correlations determined by dimension of quantum state in phase space:P-distribution

Temporal second-order coherence function for displaced-squeezed thermal states

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