Unified analytical treatments to qubit-oscillator systems

doi:10.1088/1674-1056/22/6/064205

Abstract An effective scheme within two displaced bosonic operators with equal positive and negative displacements is extended to study the qubit-oscillator systems analytically in a unified way. Many previous analytical treatments, such as generalized rotating-wave approximation (GRWA) [Phys. Rev. Lett. 99, 173601 (2007)] and an expansion in the qubit tunneling matrix element in the deep strong coupling regime [Phys. Rev. Lett. 105, 263603 (2010)] can be recovered straightforwardly within the present scheme. Moreover, further improving GRWA and the extension to the finite-bias case are implemented easily. The algebraic formulae for the eigensolutions are then derived explicitly and uniquely, which work well in a wide range of the coupling strengthes, detunings, and static bias including the recent experimentally accessible parameters. The dynamics of the qubit for an oscillator in ground-state is also studied. At the experimentally accessible coupling regime, GRWA can always work well. When the coupling is enhanced to the intermediate regime, only the improving GRWA can give the correct description, while the result of GRWA shows strong deviations. The previous Van Vleck perturbation theory is not valid to describe the dynamics in the present-day experimentally accessible regime, except for the strongly biased cases.

Keywords: numerical exact solution qubit-oscillator system dynamics

Received: 21 August 2012
Revised: 16 October 2012
Accepted manuscript online:

PACS:	42.50.Pq	(Cavity quantum electrodynamics; micromasers)
	42.50.Lc	(Quantum fluctuations, quantum noise, and quantum jumps)
	03.65.Ge	(Solutions of wave equations: bound states)

Fund: Project supported by the National Natural Science Foundation of China (Grants Nos. 11174254 and 11104363), the National Basic Research Program of China (Grant Nos. 2011CBA00103 and 2009CB929104), and the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20110191120046).

Corresponding Authors: Zhang Yu-Yu
E-mail: yuyuzh@cqu.edu.cn; qhchen@zju.edu.cn

Cite this article:

He Shu (贺树), Zhang Yu-Yu (张瑜瑜), Chen Qing-Hu (陈庆虎), Ren Xue-Zao (任学藻), Liu Tao (刘涛), Wang Ke-Lin (汪克林) Unified analytical treatments to qubit-oscillator systems 2013 Chin. Phys. B 22 064205

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Unified analytical treatments to qubit-oscillator systems

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