Decoherence of adiabatically steered quantum systems

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Article number134517
Pages (from-to)1-12
Number of pages12
JournalPhysical Review B
Volume82
Issue number13
Publication statusPublished - 12 Oct 2010
MoE publication typeA1 Journal article-refereed

Researchers

Research units

  • University of New South Wales

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.

    Research areas

  • Josephson devices, open systems, quantum statistical methods, quantum systems Decoherence, superconducting quantum interference devices

Download statistics

No data available

ID: 875530