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

Jasper van Wezel, Jan Zaanen, Jeroen van den Brink

Research output: Contribution to journalArticle (Academic Journal)peer-review

26 Citations (Scopus)

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.
Original languageEnglish
Article number094430
Number of pages14
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume74
DOIs
Publication statusPublished - 27 Sep 2006

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