Stabilizing Spin Coherence Through Environmental Entanglement in Strongly Dissipative Quantum Systems
Quantum Physics
2014-03-21 v2 Mesoscale and Nanoscale Physics
Strongly Correlated Electrons
Abstract
The key feature of a quantum spin coupled to a harmonic bath---a model dissipative quantum system---is competition between oscillator potential energy and spin tunneling rate. We show that these opposing tendencies cause environmental entanglement through superpositions of adiabatic and antiadiabatic oscillator states, which then stabilizes the spin coherence against strong dissipation. This insight motivates a fast-converging variational coherent-state expansion for the many-body ground state of the spin-boson model, which we substantiate via numerical quantum tomography.
Cite
@article{arxiv.1307.5681,
title = {Stabilizing Spin Coherence Through Environmental Entanglement in Strongly Dissipative Quantum Systems},
author = {Soumya Bera and Serge Florens and Harold U. Baranger and Nicolas Roch and Ahsan Nazir and Alex W. Chin},
journal= {arXiv preprint arXiv:1307.5681},
year = {2014}
}
Comments
5 pages, 3 figures, supplementary file attached. This article supersedes arXiv:1301.7430