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This study measures noise moments of field strength and intensity using homodyne cross-correlation. A classical inequality is violated, revealing insights into squeezed signal fields without quantum theory.

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Area of Science:

  • Quantum optics
  • Classical physics
  • Optical measurements

Background:

  • Understanding quantum phenomena often relies on complex quantum theory.
  • Simultaneous measurement of noise moments in optical fields is challenging.

Purpose of the Study:

  • To develop a classical physics-based method for analyzing squeezed signal fields.
  • To measure field strength, intensity, and their correlations simultaneously.

Main Methods:

  • Implemented a homodyne cross-correlation measurement technique.
  • Superimposed signal field and local oscillator on an unbalanced beam splitter.
  • Obtained information via intensity noise correlation of output modes.

Main Results:

  • Simultaneously measured three noise moments: field strength, intensity, and their correlations.
  • Retrieved insights into the quantumness of a squeezed signal field using an anomalous moment.
  • Violated a classical inequality involving the anomalous moment for most signal phases.

Conclusions:

  • The developed technique provides novel insights into squeezed signal fields using only classical physics.
  • Detection details like quantum efficiencies are irrelevant for this measurement technique.
  • Demonstrated the power of classical analysis in exploring quantum properties.