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Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

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Biasing of FET01:22

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Fabrication and Characterization of Superconducting Resonators
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Published on: May 21, 2016

Superconducting microwave multivibrator produced by coherent feedback.

Joseph Kerckhoff1, K W Lehnert

  • 1JILA, National Institute of Standards and Technology and the University of Colorado, Boulder, Colorado 80309, USA. jkerc@jila.colorado.edu

Physical Review Letters
|October 30, 2012
PubMed
Summary
This summary is machine-generated.

Researchers explored a nonlinear coherent feedback circuit using superconducting microwave devices. This circuit demonstrated bistable and astable states, functioning as a latch with frequency-locked oscillations, matching a new dynamical model.

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Area of Science:

  • Quantum optics
  • Superconducting circuits
  • Nonlinear dynamics

Background:

  • Coherent feedback circuits are fundamental in quantum optics and nonlinear dynamics.
  • Superconducting microwave devices offer a platform for implementing complex quantum circuits.
  • Modeling nonlinear systems can be computationally intensive and challenging.

Purpose of the Study:

  • To investigate the emergent behaviors of a nonlinear coherent feedback circuit.
  • To demonstrate the circuit's functionality as a latch and its frequency locking capabilities.
  • To validate a new semiclassical dynamical model for such systems.

Main Methods:

  • Construction of a nonlinear coherent feedback circuit using preexisting superconducting microwave devices.
  • Observation and characterization of emergent bistable and astable states.
  • Demonstration of latch operation and frequency locking of oscillations.

Main Results:

  • The circuit exhibited emergent bistable and astable states.
  • Successful demonstration of the circuit's operation as a latch.
  • Observed frequency locking of the circuit's oscillations.
  • Experimental results showed good agreement with a semiclassical dynamical model.

Conclusions:

  • Nonlinear coherent feedback circuits built from superconducting devices can exhibit complex emergent behaviors.
  • The demonstrated circuit functions effectively as a latch with tunable frequency locking.
  • A new software-derived dynamical model accurately predicts the observed system dynamics, simplifying analysis.