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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Dynamics of a tunable superfluid junction.

L J LeBlanc1, A B Bardon, J McKeever

  • 1Department of Physics, University of Toronto, 60 St. George, Toronto ON, Canada, M5S 1A7.

Physical Review Letters
|March 17, 2011
PubMed
Summary
This summary is machine-generated.

We investigated Bose-Einstein condensate dynamics in double-well potentials, observing distinct Josephson and hydrodynamic behaviors. Numerical simulations clarified the origin of higher frequencies in hydrodynamic regimes.

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Area of Science:

  • Quantum physics
  • Atomic, molecular, and optical physics
  • Condensed matter physics

Background:

  • Bose-Einstein condensates (BECs) exhibit quantum phenomena in controlled potentials.
  • Understanding BEC dynamics is crucial for quantum technologies.
  • Double-well potentials allow studying Josephson and hydrodynamic regimes.

Purpose of the Study:

  • To investigate the population dynamics of a Bose-Einstein condensate in a double-well potential.
  • To analyze the crossover from Josephson dynamics to hydrodynamic behavior.
  • To understand the origin of higher frequencies observed in hydrodynamic regimes.

Main Methods:

  • Experimental observation of BEC oscillations in a double-well potential.
  • Comparison with theoretical models, including the Josephson model.
  • Numerical simulations using the Gross-Pitaevskii equation.

Main Results:

  • Slow oscillations consistent with the Josephson model were observed at high potential barriers.
  • At low barriers, the fundamental frequency matched hydrodynamic models, with an additional higher frequency detected.
  • Numerical simulations successfully reproduced observed frequencies and amplitudes, explaining the higher mode's origin.

Conclusions:

  • The study successfully characterized the crossover between Josephson and hydrodynamic regimes in BECs.
  • The origin of the higher frequency mode in hydrodynamic BECs was elucidated through numerical simulations.
  • Findings have implications for the development and understanding of trapped matter-wave interferometers.