Continuous Monitoring of Rabi Oscillations in a Josephson Flux Qubit
Evgeni V. Il’ichev, Nikolai Oukhanski, A. Izmalkov, Th. Wagner, M. Grajcar, H.‐G. Meyer, Anatoly Yu. Smirnov, Alec Maassen van den Brink, M. H. S. Amin, Alexandre M. Zagoskin · Physical Review Letters · 2003
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 of Rabi spectroscopy enabled a long coherence time of about 2.5 micros, corresponding to an effective qubit quality factor approximately 7000.