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Two-mode correlation of microwave quantum noise generated by parametric down-conversion.

N Bergeal1, F Schackert, L Frunzio

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Researchers observed a strong correlation between microwave radiation modes amplified by a Josephson parametric converter. This quantum noise amplification, akin to parametric down-conversion, shows potential for quantum encryption and mesoscopic system measurements.

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Area of Science:

  • Quantum Optics
  • Condensed Matter Physics
  • Microwave Engineering

Background:

  • Quantum noise is a fundamental aspect of quantum mechanics.
  • Josephson parametric converters are devices capable of amplifying quantum signals.
  • Parametric down-conversion is a nonlinear optical process.

Purpose of the Study:

  • To observe and quantify the correlation between two microwave radiation modes.
  • To investigate quantum noise amplification in a Josephson parametric converter.
  • To explore potential applications in quantum technologies.

Main Methods:

  • Utilizing a Josephson parametric converter to amplify quantum noise.
  • Performing interference experiments to measure mode correlation.
  • Analyzing the contrast and photon numbers in the amplified modes.

Main Results:

  • Observed a high-contrast correlation (>99%) between two microwave radiation modes.
  • Demonstrated quantum noise amplification via parametric processes.
  • Achieved a high number of photons per mode (>250,000).

Conclusions:

  • The study confirms the correlation between amplified quantum noise modes.
  • This phenomenon offers a new pathway for generating correlated microwave photons.
  • Potential applications include enhanced dispersive measurements and secure quantum encryption.