Relation between decoherence and spontaneous symmetry breaking in many-particle qubits

Jasper van Wezel, Jan Zaanen, and Jeroen van den Brink
Phys. Rev. B 74, 094430 – Published 27 September 2006

Abstract

We have recently shown that there is a limit to quantum coherence in many-particle spin qubits due to spontaneous symmetry breaking. These results were derived for the Lieb-Mattis spin model. Here we will show that the underlying mechanism of decoherence in systems with spontaneous symmetry breaking is in fact more general. We present here a generic route to finding the decoherence time associated with spontaneous symmetry breaking in many-particle qubits, and subsequently we apply this approach to two model systems, indicating how the continuous symmetries in these models are spontaneously broken and discussing the relation of this symmetry breaking to the thin spectrum. We then present in detail the calculations that lead to the limit to quantum coherence, which is due to energy shifts in the thin spectrum.

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  • Received 15 June 2006

DOI:https://doi.org/10.1103/PhysRevB.74.094430

©2006 American Physical Society

Authors & Affiliations

Jasper van Wezel1, Jan Zaanen1, and Jeroen van den Brink1,2

  • 1Institute-Lorentz for Theoretical Physics, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands
  • 2Institute for Molecules and Materials, Radboud Universiteit Nijmegen, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands

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Issue

Vol. 74, Iss. 9 — 1 September 2006

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