Direct Josephson coupling between superconducting flux qubits
M. Grajcar, A. Izmalkov, S.H.W. van der Ploeg, S. Linzen, E. Il'ichev,, Th. Wagner, U. Hubner, H.-G. Meyer, Alec Maassen van den Brink, S. Uchaikin,, and A.M. Zagoskin
TL;DR
This paper demonstrates strong antiferromagnetic coupling between two flux qubits via a shared Josephson junction, enabling tunable coupling strength and sign, which advances quantum computing hardware design.
Contribution
It introduces a method for coupling flux qubits through a shared Josephson junction, overcoming limitations of small inductances and allowing tunable coupling.
Findings
Strong antiferromagnetic coupling achieved
Coupling sign and magnitude measured via tank circuit
Design modifications enable tunable and ferromagnetic coupling
Abstract
We have demonstrated strong antiferromagnetic coupling between two three-junction flux qubits based on a shared Josephson junction, and therefore not limited by the small inductances of the qubit loops. The coupling sign and magnitude were measured by coupling the system to a high-quality superconducting tank circuit. Design modifications allowing to continuously tune the coupling strength and/or make the coupling ferromagnetic are discussed.
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