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Area of Science:

  • Quantum Physics
  • Quantum Optics
  • Atomic Physics

Background:

  • The Einstein-Bohr interferometer is a thought experiment crucial for understanding quantum mechanics.
  • Reproducing this experiment with a quantum-limited, movable slit has been a significant challenge.

Purpose of the Study:

  • To experimentally realize the Einstein-Bohr interferometer.
  • To investigate quantum measurement and the quantum-to-classical transition.

Main Methods:

  • Utilized a single atom in a 3D ground-state-cooled optical tweezer as a quantum beam splitter.
  • Momentum entanglement between the atom and a photon was established.
  • Dynamically tuned the atom's momentum uncertainty by varying optical tweezer trap depth.

Main Results:

  • Achieved a functional Einstein-Bohr interferometer with a single atom.
  • Observed a gradual shift in single-photon interference visibility by tuning momentum uncertainty.
  • Differentiated quantum-limited noise from classical atom heating noise.

Conclusions:

  • The single-atom interferometer provides a novel platform for exploring fundamental quantum phenomena.
  • Demonstrated control over quantum measurement and observed a quantum-to-classical transition.