Decoherence of adiabatically steered quantum systems
Loading...
Access rights
openAccess
publishedVersion
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
Date
2010-10-12
Department
Major/Subject
Mcode
Degree programme
Language
en
Pages
12
1-12
1-12
Series
PHYSICAL REVIEW B, Volume 82, issue 13
Abstract
We study the effect of Markovian environmental noise on the dynamics of a two-level quantum system which is steered adiabatically by an external driving field. We express the master equation taking consistently into account all the contributions to the lowest nonvanishing order in the coupling to the Markovian environment. We study the master equation numerically and analytically and we find that, in the adiabatic limit, a zero-temperature environment does not affect the ground-state evolution. As a physical application, we discuss extensively how the environment affects Cooper-pair pumping. The adiabatic ground-state pumping appears to be robust against environmental noise. In fact, the relaxation due to the environment is required to avoid the accumulation of small errors from each pumping cycle. We show that neglecting the nonsecular terms in the master equation leads to unphysical results, such as charge nonconservation. We discuss also a possible way to control the environmental noise in a realistic physical setup and its influence on the pumping process.Description
Keywords
Josephson devices, open systems, quantum statistical methods, quantum systems Decoherence, superconducting quantum interference devices
Other note
Citation
Solinas , P , Möttönen , M , Salmilehto , J & Pekola , J 2010 , ' Decoherence of adiabatically steered quantum systems ' , Physical Review B , vol. 82 , no. 13 , 134517 , pp. 1-12 . https://doi.org/10.1103/PhysRevB.82.134517