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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Quantum coherence engineering in the integer quantum Hall regime.

P-A Huynh1, F Portier, H le Sueur

  • 1CEA, SPEC, Nanoelectronics Group, URA 2464, F-91191 Gif-sur-Yvette, France.

Physical Review Letters
|September 26, 2012
PubMed
Summary
This summary is machine-generated.

Researchers tuned quantum coherence in quantum Hall edge states using a decoupling gate. Reducing coupling between edge states at finite temperatures significantly enhanced phase coherence, paving the way for improved quantum Hall systems.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Hall Effect
  • Mesoscopic Physics

Background:

  • Quantum coherence in edge states is crucial for quantum devices.
  • Understanding and controlling inter-edge state coupling is key to enhancing coherence.
  • The integer quantum Hall regime offers a platform to study these phenomena.

Purpose of the Study:

  • To investigate the tuning of quantum coherence in quantum Hall edge states.
  • To explore the impact of inter-edge state coupling on coherence length.
  • To analyze the influence of a decoupling gate on quantum interference visibility.

Main Methods:

  • Utilized a Mach-Zehnder interferometer to measure quantum interference visibility.
  • Operated in the integer quantum Hall regime at filling factor 2.
  • Varied temperature and employed a decoupling gate to tune inter-edge state coupling.

Main Results:

  • Coherence length was found to be temperature-dependent, tunable by a factor of 2.
  • Reduced coupling between copropagating edge states at finite temperatures strengthened phase coherence.
  • Quantum interference visibility showed distinct dependencies on injection bias, influenced by inter-edge state coupling.

Conclusions:

  • A decoupling gate effectively tunes quantum coherence in quantum Hall edge states.
  • Reducing inter-edge state coupling is a viable strategy for improving phase coherence.
  • Inter-edge state coupling significantly impacts the bias dependence of quantum interference visibility.