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Journal of Atomic and Molecular Physics

Dynamical suppression of spontaneous emission in two-level atom

Zhongjie Wang

Published Jan 1, 2006• 0 citations
OpenAlex

Abstract

Dynamical control of decoherence induced by the environment in a twolevel atom system is investigated.We choose the suitable perturbations acting on the qubit system to decrease the decoherence due to spontaneous emission damping.The scheme proposed here is based on the frequency-displacement technique and the parity-kick technique,which are realized by two homogeneous classical large detuned optical fields with different frequencies added to the system.By applying this scheme,in presence of spontaneous emission,the decoherence can be efficiently suppressed.

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Dynamical control of decoherence induced by the environment in a twolevel atom system is investigated.We choose the suitable perturbations acting on the qubit system to decrease the decoherence due to spontaneous emission damping.The scheme proposed here is based on the frequency-displacement technique and the parity-kick technique,which are realized by two homogeneous classical large detuned optical fields with different frequencies added to the system.By applying this scheme,in presence of spontaneous emission,the decoherence can be efficiently suppressed.
Dynamical control of decoherence induced by the environment in a single quantum-bit system is investigated. We choose the suitable perturbations acting on the qubit system to decrease the decoherence due to pure amplitude damping. The scheme proposed here is based on the free-Hamiltonian-elimination technique and the parity-kick technique, which concludes two homogeneous classical large-blue-detuned optical fields with different frequencies added to the qubit system. By applying this scheme, the decoherence can be completely suppressed.
Dynamical control of decoherence induced by the environment in a single trapped ion system is investigated.The scheme proposed here is based on the composition of the frequency-shift and parity-kick technique. The former is realized by a homogeneous classical large-detuned optical fields added to the ion system,while the latter is realized by a series of π pulses.With application of this scheme,the decoherence induced by the bath can be efficiently eliminated.Numerical calculation shows that this scheme is superior to the parity-kick scheme.
The modification of the spontaneous emission spectrum has been studied in this paper in a four-level doubly driven N-type atomic system. In the presence of two coherent fields, emphasis has been given to studying the spectral distribution of spontaneous emission in the relaxation process of the initially prepared excited level. The phenomenon of quantum interference dynamically induced in the system by these fields can significantly change the spontaneous emission spectrum. We have shown the emergence of a two-peak spectrum where two widely separated symmetric peaks are associated with a sharp dark line at their mid-position. At different dynamic conditions, we have also shown that two symmetric peaks may appear in the spectrum with an extended dark zone between them. Depending on the values of the Rabi frequencies and the detunings of the external fields, one can achieve a large enhancement of very narrow spectral components within the spontaneous emission line shape under different conditions. The phenomenon of suppression of spectral line and the selective cancellation of spontaneous emission have also been discussed. The results shown in various cases are analysed by considering all possible dressed states corresponding to the bare state model. The influence of collision-induced effects on the spontaneous emission spectrum is investigated as a conditional case.
The spontaneous emission of radiation from two two-level atoms in a Fabry–Perot cavity is considered. The transition frequency of the atoms is assumed to be modulated. It is shown that the frequency modulation leads to radical change of the spontaneous emission dynamics, including the decoherence properties of the entangled atomic states. Two ingredients are necessary in order to achieve this. Firstly, the modulation should be able to periodically detune the atoms from the resonance with the cavity. Secondly, the dynamics of spontaneous emission is efficiently modified if a resonant condition between the modulation frequency and modulation depth is fulfilled. Thus, frequency modulation can be used to dynamically control the collective effects in spontaneous emission in cavities.
The spontaneous emission is investigated for an effective atomic two-level system in an intense coherent field with frequency lower than the vacuum-induced decay width. As this additional low-frequency field is assumed to be intense, multiphoton processes may be induced, which can be seen as alternative transition pathways in addition to the simple spontaneous decay. The interplay of the various interfering transition pathways influences the decay dynamics of the two-level system and may be used to slow down the spontaneous decay considerably. We derive from first principles an expression for the Hamiltonian including up to three-photon processes. This Hamiltonian is then applied to a quantum mechanical simulation of the decay dynamics of the two-level system. Finally, we discuss numerical results of this simulation based on a rubidium atom and show that the spontaneous emission in this system may be suppressed substantially.