Signal-to-pump back action and self-oscillation in double-pump Josephson parametric amplifier
- Department of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520-8284 (United States)
We present the theory of a Josephson parametric amplifier employing two-pump sources. Our calculations are based on input-output theory, and can easily be generalized to any coupled system involving parametric interactions. We analyze the operation of the device, taking into account the feedback introduced by the reaction of the signal and noise on the pump power, and in this framework, compute the response functions of interest--signal and idler gains, internal gain of the amplifier, and self-oscillation signal amplitude. To account for this back action between signal and pump, we adopt a mean-field approach and self-consistently explore the boundary between amplification and self-oscillation. The coincidence of bifurcation and self-oscillation thresholds reveals that the origin of coherent emission of the amplifier lies in the multiwave mixing of the noise components. Incorporation of the back action leads the system to exhibit hysteresis, dependent on parameters such as temperature and detuning from resonance. Our analysis also shows that the resonance condition itself changes in the presence of back action and this can be understood in terms of the change in plasma frequency of the junction. The potential of the double-pump amplifier for quantum-limited measurements and as a squeezer is also discussed.
- OSTI ID:
- 21287012
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 18 Vol. 79; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
AMPLITUDES
BIFURCATION
COMPUTERIZED SIMULATION
EMISSION
FEEDBACK
GAIN
HYSTERESIS
INTERACTIONS
JOSEPHSON EFFECT
LANGMUIR FREQUENCY
MEAN-FIELD THEORY
MIXING
NOISE
OPERATION
OSCILLATIONS
PARAMETRIC AMPLIFIERS
QUANTUM MECHANICS
RESONANCE
RESPONSE FUNCTIONS
SIGNALS