Research on System Coherence Evolution of Different Environmental Models

• Published in: International journal of theoretical physics Vol. 57; no. 4; pp. 1004 - 1012
• Main Authors: Zhang, Si-Qi, Lu, Jing-Bin, Li, Hong, Liu, Ji-Ping, Zhang, Xiao-Ru, Liu, Han, Liang, Yu, Ma, Ji, Liu, Xiao-Jing, Wu, Xiang-Yao
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.04.2018; Springer Nature B.V
• Subjects: Elementary Particles; Energy gap; Energy levels; Environment models; Evolution; Mathematical and Computational Physics; Modulation; Nuclear electric power generation; Nuclear energy; Photonic band gaps; Photonics; Physics; Physics and Astronomy; Quantum Field Theory; Quantum Physics; Theoretical; Spontaneous emission; Dynamic reservoir; Quantum control; Excited atom
• ISSN: 0020-7748; 1572-9575
• DOI: 10.1007/s10773-017-3633-y

In this paper, we have studied the evolution curve of two-level atomic system that the initial state is excited state. At the different of environmental reservoir models, which include the single Lorentzian, ideal photon band-gap, double Lorentzian and square Lorentzian reservoir, we researched the influence of these environmental reservoir models on the evolution of energy level population. At static no modulation, comparing the four environmental models, the atomic energy level population oscillation of square Lorentzian reservoir model is fastest, and the atomic system decoherence is slowest. Under dynamic modulation, comparing the photon band-gap model with the single Lorentzian reservoir model, no matter what form of dynamic modulation, the time of atoms decay to the ground state is longer for the photonic band-gap model. These conclusions make the idea of using the environmental change to modulate the coherent evolution of atomic system become true.