Switchable resonant coupling of flux qubits

Abstract

We propose a coupling scheme, where two or more flux qubits with different eigenfrequencies share Josephson junctions with a coupler loop devoid of its own quantum dynamics. Switchable two-qubit coupling is realized by tuning the frequency of the AC magnetic flux through the coupler to a combination frequency of two of the qubits. The coupling allows any or all of the qubits to be simultaneously at the degeneracy point and can change sign.

REVTeX 4, 4 pages, 2 figures, v2: reference added, v3: final version published in Phys. Rev. B

References in corpus (4)

• Superconducting Circuits and Quantum Information
• Parametric coupling for superconducting qubits
• Tunable coupling scheme for flux qubits at the optimal point
• Mediated tunable coupling of flux qubits

Cited by in corpus (10)

• Controllable coupling of superconducting flux qubits
• Interqubit coupling mediated by a high-excitation-energy quantum object
• Long-range coupling and scalable architecture for superconducting flux qubits
• Protecting entanglement in superconducting qubits
• Spectroscopy of three strongly coupled flux qubits
• Spectroscopy of superconducting charge qubits coupled by a Josephson inductance
• Switchable coupling for superconducting qubits using double resonance in the presence of crosstalk
• Switchable coupling between charge and flux qubits
• Pseudo-Rabi oscillations in superconducting flux qubits in the classical regime
• Entanglement and Bell States in Superconducting Flux Qubits