Spectroscopy of a driven solid-state qubit coupled to a structured
environment |
| |
Authors: | Email author" target="_blank">M C?GoordenEmail author M?Thorwart M?Grifoni |
| |
Institution: | (1) Instituut-Lorentz, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands;(2) Institut für Theoretische Physik IV, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany;(3) Institut für Theoretische Physik, Universität Regensburg, 93035 Regensburg, Germany |
| |
Abstract: | We study the asymptotic dynamics of a driven spin-boson system
where the environment is formed by a broadened localized mode.
Upon exploiting an exact mapping, an equivalent formulation of the
problem in terms of a quantum two-state system (qubit) coupled to
a harmonic oscillator which is itself Ohmically damped, is found.
We calculate the asymptotic population difference of the two
states in two complementary parameter regimes. For weak damping
and low temperature, a perturbative Floquet-Born-Markovian master
equation for the qubit-oscillator system can be solved. We find
multi-photon resonances corresponding to transitions in the
coupled quantum system and calculate their line-shape
analytically. In the complementary parameter regime of strong
damping and/or high temperatures, non-perturbative real-time path
integral techniques yield analytic results for the resonance line
shape. In both regimes, we find very good agreement with exact
results obtained from a numerical real-time path-integral
approach. Finally, we show for the case of strong detuning between
qubit and oscillator that the width of the n-photon resonance
scales with the nth Bessel function of the driving strength in
the weak-damping regime. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|