Nonequilibrium phases in hybrid arrays with flux qubits and NV centers

We 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 (NV) centers. The underlying description is a Jaynes-Cummings...

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Bibliographic Details
Published in:arXiv.org 2012-05
Main Authors: Hümmer, Thomas, Reuther, Georg M, Hänggi, Peter, Zueco, David
Format: Article
Language:English
Subjects:
Arrays
Coupling
Crystal lattices
Diamonds
Lattice sites
Lattice vacancies
Localization
Monitoring
Quantum theory
Qubits (quantum computing)
Transportation networks
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Summary:We 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 (NV) 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 non-equilibrium 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) to investigate localization-delocalization transitions in arbitrary dimensions and (ii) to tune the inter-site coupling in-situ.
ISSN:2331-8422
DOI:10.48550/arxiv.1203.1857