Macroscopic Many-Qubit Interactions in Superconducting Flux Qubits

Abstract

Superconducting flux qubits are considered to investigate macroscopic many-qubit interactions. Many-qubit states based on current states can be manipulated through the current-phase relation in each superconducting loop. For flux qubit systems comprised of $N$ qubit loops, a general expression of low energy Hamiltonian is presented in terms of low energy levels of qubits and macroscopic quantum tunnelings between the many-qubit states. Many-qubit interactions classified by {\em Ising type- or tunnel-}exchange interactions can be observable experimentally. Flux qubit systems can provide various artificial-spin systems to study many-body systems that cannot be found naturally.

5 pages, 1 figure

References in corpus (7)

• Spectroscopy on two coupled flux qubits
• Controllable coupling of superconducting flux qubits
• Four-qubit device with mixed couplings
• Switchable resonant coupling of flux qubits
• Macroscopic Greenberger-Horne-Zeilinger and W States in Flux Qubits
• Controllable Coupling in Phase-Coupled Flux Qubits
• Entanglement and Bell States in Superconducting Flux Qubits

Cited by in corpus (1)

• Open system quantum annealing in mean field models with exponential degeneracy