2003Physical Review LettersOpen access

Continuous Monitoring of Rabi Oscillations in a Josephson Flux Qubit

E. Il’ichev, N. Oukhanski, A. Izmalkov, Th. Wagner, M. Grajcar, H.‐G. Meyer, Anatoly Yu. Smirnov, Alec Maassen van den Brink, M. H. S. Amin, A. M. Zagoskin

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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 of Rabi spectroscopy enabled a long coherence time of about 2.5 micros, corresponding to an effective qubit quality factor approximately 7000.

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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.

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Available 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 of Rabi spectroscopy enabled a long coherence time of about 2.5 micros, corresponding to an effective qubit quality factor approximately 7000.

Key concepts: Rabi cycle, Flux qubit, Physics, Phase qubit, Rabi frequency, Qubit, Charge qubit, Coherence (philosophical gambling strategy)

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