Coherent oscillations in a superconducting tunable flux qubit manipulated without microwaves

Abstract

We experimentally demonstrate the coherent oscillations of a tunable superconducting flux qubit by manipulating its energy potential with a nanosecond-long pulse of magnetic flux. The occupation probabilities of two persistent current states oscillate at a frequency ranging from 6 GHz to 21 GHz, tunable via the amplitude of the flux pulse. The demonstrated operation mode allows to realize quantum gates which take less than 100 ps time and are thus much faster compared to other superconducting qubits. An other advantage of this type of qubit is its insensitivity to both thermal and magnetic field fluctuations.

5 pages, 5 figures

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• A dynamical composition law for boundary conditions
• Broadband noise decoherence in solid-state complex architectures
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• Hearing the shape of a quantum boundary condition
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• Tunability of Excited-State Energy Levels of Four-Josephson-Junction Circuit in Crossover from Double-Well to Single-Well Potential
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