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Related Concept Videos

Damped Oscillations01:07

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In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
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Updated: May 24, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Quantum and classical chirps in an anharmonic oscillator.

Yoni Shalibo1, Ya'ara Rofe, Ido Barth

  • 1Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.

Physical Review Letters
|March 10, 2012
PubMed
Summary

We observed enhanced lifetimes for excited states in a Josephson phase circuit, transitioning from wave packet dynamics to discrete energy levels with changing system anharmonicity.

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Area of Science:

  • Quantum physics
  • Condensed matter physics

Background:

  • The Josephson phase circuit is a tunable quantum system exhibiting anharmonicity.
  • Understanding quantum system dynamics under external drives is crucial for quantum technologies.

Purpose of the Study:

  • To investigate the state dynamics of a Josephson phase circuit driven by a frequency-chirped field.
  • To explore the transition between classical-like wave packet evolution and quantum discrete energy level excitation.

Main Methods:

  • Utilizing a frequency-chirped drive to excite the Josephson phase circuit.
  • Measuring the system's state dynamics across varying anharmonicity levels.
  • Mapping the transition threshold between different dynamical regimes.

Main Results:

  • Observed wave packet-like state evolution at small anharmonicity, characteristic of classical oscillators.
  • Reported exponentially enhanced lifetimes for highly excited states in this regime.
  • Detected sharp steps corresponding to discrete energy level excitation at large anharmonicity.

Conclusions:

  • Demonstrated a continuous transition between classical and quantum dynamical regimes in an anharmonic circuit.
  • The Josephson phase circuit's response can be tuned from wave packet dynamics to discrete level excitation.
  • This study provides insights into controlling quantum states in anharmonic systems.