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The de Broglie Wavelength02:32

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

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Published on: March 30, 2017

Counting atoms using interaction blockade in an optical superlattice.

P Cheinet1, S Trotzky, M Feld

  • 1Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz, Germany.

Physical Review Letters
|October 15, 2008
PubMed
Summary

We observed an interaction blockade effect in ultracold atoms, similar to Coulomb blockade. This allows precise counting and control of atoms in optical lattices, revealing their distribution.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Many-Body Systems
  • Condensed Matter Physics

Background:

  • Ultracold atoms in optical lattices offer a controllable platform for simulating complex quantum phenomena.
  • Analogies between cold atom systems and solid-state physics can provide new insights into both fields.
  • Controlling and counting individual atoms in quantum systems is crucial for quantum simulation and information processing.

Purpose of the Study:

  • To investigate and demonstrate an interaction blockade effect in ultracold atoms trapped in optical lattices.
  • To establish a method for precisely counting and controlling atom numbers within lattice sites.
  • To determine the atom number distribution in different quantum regimes (superfluid and Mott insulator).

Main Methods:

  • Creation of ultracold atoms in optical lattices.
  • Conversion of lattice sites into biased double wells.
  • Application of bias potentials to induce tunneling resonances.
  • Measurement of well population and plateau amplitudes.

Main Results:

  • Observation of discrete steps in well population corresponding to single-atom tunneling events.
  • Demonstration of an interaction blockade effect analogous to Coulomb blockade.
  • Successful determination of atom number distribution for both superfluid and Mott insulating states of 87Rb atoms.

Conclusions:

  • The interaction blockade effect provides a robust method for atom counting and control in optical lattices.
  • This technique enables detailed characterization of quantum states in ultracold atom systems.
  • The findings open new avenues for quantum simulation and precision measurements using ultracold atoms.