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Updated: Jun 3, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
Tunable coupling in circuit quantum electrodynamics using a superconducting charge qubit with a V-shaped energy level
S J Srinivasan1, A J Hoffman, J M Gambetta
1Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA.
Abstract:
We introduce a new type of superconducting charge qubit that has a V-shaped energy spectrum and uses quantum interference to provide independently tunable qubit energy and coherent coupling to a superconducting cavity. Dynamic access to the strong coupling regime is demonstrated by tuning the coupling strength from less than 200 kHz to greater than 40 MHz. This tunable coupling can be used to protect the qubit from cavity-induced relaxation and avoid unwanted qubit-qubit interactions in a multiqubit system.
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