Parametrically-induced tunable coupling between flux qubits - Dependence on the coupler bias

Khalil Harrabi*, Fumiki Yoshihara, Antti O. Niskanen, Yasunobu Nakamura, Jaw Shen Tsai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We have studied a tunable coupling scheme of two superconducting flux qubits biased at the degeneracy point. The qubits are coupled parametrically under microwave driving, via nonlinear inductance of a third qubit biased slightly away from the degeneracy point. The observed on-state coupling as well as the off-state residual coupling depend non-monotonically on the coupler bias point and agree quantitatively with calculations based on a three-qubit Hamiltonian. This simple model is useful to optimize the parameters for a large on/off ratio.

Original languageEnglish
Article number022023
JournalJournal of Physics: Conference Series
Issue number2
StatePublished - 2009
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (all)


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