Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.117005
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Funding
- Office of Naval Research [N00014-07-1-0774]
- UC Berkeley Chancellor's Faculty Partnership Fund
- Hellman Family Faculty Fund
- U.S.-Israel Binational Science Foundation [2004033]
- U. S. Department of Energy [DE-FG02-04ER41289]
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We observe a sharp threshold for dynamic phase locking in a high-Q transmission line resonator embedded with a Josephson tunnel junction, and driven with a purely ac, chirped microwave signal. When the drive amplitude is below a critical value, which depends on the chirp rate and is sensitive to the junction critical current I(0), the resonator is only excited near its linear resonance frequency. For a larger amplitude, the resonator phase locks to the chirped drive and its amplitude grows until a deterministic maximum is reached. Near threshold, the oscillator evolves smoothly in one of two diverging trajectories, providing a way to discriminate small changes in I(0) with a nonswitching detector, with potential applications in quantum state measurement.
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