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Bulletin of the American Physical Society

Long coherence time in a superconducting persistent-current qubit

Jonas Bylander, Simon Gustavsson, Fumiki Yoshihara, K. Harrabi, Yasunobu Nakamura, Jaw-Shen Tsai, William D. Oliver

Published Mar 18, 2010• 0 citations
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We experimentally demonstrate 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 by changing the amplitude of the flux pulse. The demonstrated operation mode could allow quantum gates to be realized in less than 100 ps, which is much shorter than gate times attainable in other superconducting qubits. Another advantage of this type of qubit is its immunity to both thermal and magnetic field fluctuations.