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Nonequilibrium phases in hybrid arrays with flux qubits and nitrogen-vacancy centers

AuthorsHümmer, Thomas; Reuther, Georg M.; Hänggi, Peter; Zueco, David
Issue Date2012
PublisherAmerican Physical Society
CitationPhysical Review A 85(5): 052320 (2012)
AbstractWe propose a startling hybrid quantum architecture for simulating a localization-delocalization transition. The concept is based on an array of superconducting flux qubits which are coupled to a diamond crystal containing nitrogen-vacancy centers. The underlying description is a Jaynes-Cummings lattice in the strong-coupling regime. However, in contrast to well-studied coupled cavity arrays, the interaction between lattice sites is mediated here by the qubit rather than by the oscillator degrees of freedom. Nevertheless, we point out that a transition between a localized and a delocalized phase occurs in this system as well. We demonstrate the possibility of monitoring this transition in a nonequilibrium scenario, including decoherence effects. The proposed scheme allows the monitoring of localization-delocalization transitions in Jaynes-Cummings lattices by use of currently available experimental technology. Contrary to cavity-coupled lattices, our proposed recourse to stylized qubit networks facilitates (i) investigating localization- delocalization transitions in arbitrary dimensions and (ii) tuning the intersite coupling in situ. © 2012 American Physical Society.
Identifiersdoi: 10.1103/PhysRevA.85.052320
issn: 1050-2947
e-issn: 1094-1622
Appears in Collections:(ICMA) Artículos
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