Continuous Monitoring of Rabi Oscillations in a Josephson Flux Qubit

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 microseconds, corresponding to an effective qubit quality factor \~7000.

REVTeX4, 4pp., 4 EPS figure files. v3: changed title, fixed typos; final, to appear in PRL

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• Quantum state engineering with Josephson-junction devices
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• Coherent Quantum Dynamics of a Superconducting Flux Qubit
• Continuous weak measurement of quantum coherent oscillations
• Tunable coupling of superconducting qubits
• Communicating Josephson Qubits
• Low-frequency characterization of quantum tunneling in flux qubits
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