Four-junction superconducting circuit

Abstract

We develop a theory for the quantum circuit consisting of a superconducting loop interrupted by four Josephson junctions and pierced by a magnetic flux (either static or time-dependent). In addition to the similarity with the typical three-junction flux qubit in the double-well regime, we demonstrate the difference of the four-junction circuit from its three-junction analogue, including its advantages over the latter. Moreover, the four-junction circuit in the single-well regime is also investigated. Our theory provides a tool to explore the physical properties of this four-junction superconducting circuit.

9 pages, 4 figures

References in corpus (1)

• Interqubit coupling mediated by a high-excitation-energy quantum object

Cited by in corpus (3)

• Harvesting Multiqubit Entanglement from Ultrastrong Interactions in Circuit Quantum Electrodynamics
• Nonlocal Activation of Bound Entanglement via Local Quantum Zeno Dynamics
• Circulator function in a Josephson junction circuit and braiding of Majorana zero modes