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

Khalil Harrabi, Fumiki Yoshihara, Antti Niskanen, Yasunobu Nakamura, Jaw-Shen Tsai

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-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 number22023
Number of pages4
JournalJournal of Physics: Conference Series
Publication statusPublished - 2009
MoE publication typeA4 Article in a conference publication
Event25th International Conference on Low Temperature Physics (LT25) - Amsterdam, Netherlands
Duration: 6 Aug 200813 Aug 2008


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