Tuning the gap of a superconducting flux qubit

We experimentally demonstrate the in situ tunability of the minimum energy splitting (gap) of a superconducting flux qubit by means of an additional flux loop. Pulses applied via a local control line allow us to tune the gap over a range of several GHz on a nanosecond time scale. The strong flux sen...

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Bibliographic Details
Published in:Physical review letters 2009-03, Vol.102 (9), p.090501-090501, Article 090501
Main Authors: Paauw, F G, Fedorov, A, Harmans, C J P M, Mooij, J E
Format: Article
Language:English
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Summary:We experimentally demonstrate the in situ tunability of the minimum energy splitting (gap) of a superconducting flux qubit by means of an additional flux loop. Pulses applied via a local control line allow us to tune the gap over a range of several GHz on a nanosecond time scale. The strong flux sensitivity of the gap (up to approximately 0.7 GHz/mPhi0) opens up the possibility to create different types of tunable couplings that are effective at the degeneracy point of the qubit. We investigate the dependence of the relaxation time and the Rabi frequency on the qubit gap.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.102.090501