Nonequilibrium phases in hybrid arrays with flux qubits and NV centers

Abstract

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.

Version to be published in Phys. Rev. A

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Cited by in corpus (7)

• Quantum technologies with hybrid systems
• Implementation of the Dicke lattice model in hybrid quantum system arrays
• Enhanced molecular spin-photon coupling at superconducting nanoconstrictions
• Non-equilibrium many-body effects in driven nonlinear resonator arrays
• Nonlinear quantum optics in the (ultra)strong light-matter coupling
• Strong single-photon optomechanical coupling in a hybrid quantum system
• Perspective on witnessing entanglement in hybrid quantum systems