Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-06-06
Phys. Rev B. 74, 094430 (2006).
Physics
Condensed Matter
Strongly Correlated Electrons
14 pages, 5 figures
Scientific paper
10.1103/PhysRevB.74.094430
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.
van den Brink Jeroen
Wezel Jasper van
Zaanen Jan
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