Coherent Operation of a Gap-tunable Flux Qubit

Details Coherent Operation of a Gap-tunable Flux Qubit Coherent Operation of a Gap-tunable Flux Qubit

2010-08-24

arxiv.org/abs/1008.4016v1

Physics

Condensed Matter

Superconductivity

3 pages, 4 figures

Scientific paper

We replace the Josephson junction defining a three-junction flux qubit's properties with a tunable direct current superconducting quantum interference devices (DC-SQUID) in order to tune the qubit gap during the experiment. We observe different gaps as a function of the external magnetic pre-biasing field and the local magnetic field through the DC-SQUID controlled by high-bandwidth on chip control lines. The persistent current and gap behavior correspond to numerical simulation results. We set the sensitivity of the gap on the control lines during the sample design stage. With a tuning range of several GHz on a qubit dynamics timescale, we observe coherent system dynamics at the degeneracy point.

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