Continuous Monitoring of Rabi Oscillations in a Josephson Flux Qubit
E. Il'ichev, N. Oukhanski, A. Izmalkov, Th. Wagner, M. Grajcar, H. -G. Meyer, A. Yu. Smirnov, Alec Maassen van den Brink, M. H. S. Amin, A. M. Zagoskin
Abstract
Under resonant irradiation, a quantum system can undergo coherent (Rabi) oscillations in time. We report evidence for such oscillations in a continuously observed three-Josephson-junction flux qubit, coupled to a high-quality tank circuit tuned to the Rabi frequency. In addition to simplicity, this method ofRabi spectroscopy enabled a long coherence time of about 2.5 microseconds, corresponding to an effective qubit quality factor \~7000.
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