Phys. Rev. Lett. 102, 090501 (2009) [4 pages]Tuning the Gap of a Superconducting Flux QubitReceived 9 December 2008; published 5 March 2009 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 ∼0.7 GHz/mΦ0) 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. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.090501
DOI:
10.1103/PhysRevLett.102.090501
PACS:
03.67.Lx, 85.25.Cp
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