Abstract
Wehrl entropy and its density are used to investigate the dynamics of loss of coherence and information in a phase space for an atomic model of two-photon two-level atom coupled to different radiation reservoirs (namely, normal vacuum (NV), thermal field (TF) and squeezed vacuum (SV) reservoirs). Particularly, quantum interference (QI) effect, due to the 2-photon transition decay channels, has a paramount role in: (i) the atomic inversion decay in the NV case, which behaves as quantum Zeno and anti-Zeno decay effect; (ii) the coherence and information loss in the phase space; and (iii) identifying temporal information entropy squeezing. Results are also sensitive to the initial atomic state.
Highlights
Generated coherence or quantum interference (QI) process occurs in atomic systems with multi-level structure. it is a result of coupling between two, or more, indirect photon emission channels [1,2]
Two remarks are noted about Equation (1): (i) the time-dependent harmonic coefficients are due to the presence of the squeezed vacuum (SV) reservoir (M 6= 0); and (ii) the coupling of the atomic variables, rz,± (t), is wholly due to the QI process ( f 6= 0)
We have examined the model of 2-level atom model with two-photon transition in the presence of different radiation reservoirs, namely, the normal vacuum (NV), thermal field (TF) and SV reservoirs
Summary
Generated coherence or quantum interference (QI) process occurs (among other systems) in atomic systems with multi-level structure. it is a result of coupling between two, or more, indirect photon emission channels [1,2]. The QI process has shown its role in many experimental quantum optical phenomena These include, among others, resonance fluorescence linewidth narrowing (i.e., reduction of radiative decay rate) [3] and zero absorption spectrum of a weak field probing atomic media (i.e., transparent atomic medium) [4,5,6,7]. This has its implications, within quantum information processing, to transform information via a probe pulse without any distortion, as well potential applications in other phenomena in non-linear optics [8], e.g., lasing without inversion, slowing and storing light [9,10], and superluminal light propagation ([11] and references therein).
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