Coherent Operation of a Gap-tunable Flux Qubit

Abstract

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.

3 pages, 4 figures

References in corpus (8)

• Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
• Superconducting Circuits and Quantum Information
• Decoherence of flux qubits due to 1/f flux noise
• Observation of Berry's Phase in a Solid State Qubit
• Tuning the Gap of a Superconducting Flux Qubit
• Dephasing of a superconducting flux qubit
• Strong Coupling of a Quantum Oscillator to a Flux Qubit at its Symmetry Point
• Coupling superconducting flux qubits at optimal point via dynamic decoupling with the quantum bus

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