Tuning the Gap of a Superconducting Flux Qubit

Details Tuning the Gap of a Superconducting Flux Qubit Tuning the Gap of a Superconducting Flux Qubit

2008-12-10

arxiv.org/abs/0812.1912v1

Phys. Rev. Lett. 102, 090501 (2009)

Physics

Condensed Matter

Superconductivity

submitted to PRL, 4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.102.090501

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 timescale. The strong flux sensitivity of the gap (up to 0.7 GHz/mPhi_0) 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.

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