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Interferences in parametric interactions driven by quantized fields.

G S Agarwal1

  • 1Department of Physics, Oklahoma State University, Stillwater, 74078, USA.

Physical Review Letters
|August 16, 2006
PubMed
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Quantum fluctuations in a parametric amplifier show interferences when driven by a quantized field. These quantum interferences, dependent on input phase fluctuations, mirror classical observations and can be controlled by adjusting field squeezing.

Area of Science:

  • Quantum Optics
  • Nonlinear Optics
  • Quantum Information

Background:

  • Parametric amplifiers are crucial for quantum signal processing.
  • Understanding quantum fluctuations is key to advancing quantum technologies.
  • Classical domain interferences in parametric amplifiers have been recently observed.

Purpose of the Study:

  • To investigate quantum interferences in the output of a parametric amplifier.
  • To explore the role of quantized fields and phase fluctuations in these interferences.
  • To establish a quantum counterpart to recently observed classical interferences.

Main Methods:

  • Driving a parametric amplifier cavity with a quantized field at the signal frequency.
  • Analyzing the quantum fluctuations and spectral properties of the amplifier's output.

Related Experiment Videos

  • Investigating the influence of input field phase fluctuations and squeezing on the observed interferences.

    • Main Results:

    • Observed interferences in quantum fluctuations of the parametric amplifier output.
    • Demonstrated that these interferences depend on the phase fluctuations of the input quantized field.
    • Showcased spectral splitting in the output, analogous to classical observations.
    • Confirmed that interferences can be manipulated by altering the squeezing of the input field.

    Conclusions:

    • Quantum interferences in parametric amplifiers are a significant phenomenon with a direct classical counterpart.
    • The phase fluctuations of the input quantized field play a critical role in these quantum interferences.
    • The ability to manipulate these interferences opens avenues for controlling quantum states and signals.