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Quantifying quantum correlations is essential for quantum technologies. This study introduces a method using intensity moments to precisely measure quantum correlations in Gaussian fields, enabling better control and engineering of quantum devices.

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Area of Science:

  • Quantum optics and information science.
  • Development of novel quantum measurement techniques.

Background:

  • Accurate quantification of quantum correlations is vital for advancing quantum technologies.
  • Existing methods may require complex experimental setups or detailed state information.

Purpose of the Study:

  • To develop a general and experimentally accessible method for quantifying diverse quantum correlations.
  • To utilize readily available experimental data, specifically intensity moments, for this quantification.

Main Methods:

  • Derivation of a method using experimental intensity moments up to the fourth order.
  • Exact determination of global and marginal impurities for two-beam Gaussian fields.
  • Application to quantify steering, negativity bounds, Kullback-Leibler divergence, and squeezing variances.

Main Results:

  • Successfully quantified various quantum correlations using only intensity moments.
  • Demonstrated the method on experimental twin beams and squeezed super-Gaussian beams.
  • Validated the precise determination of impurities and variances.

Conclusions:

  • The developed method provides an efficient way to characterize quantum correlations in Gaussian fields.
  • This approach is applicable to both two-beam and multibeam systems.
  • Facilitates enhanced understanding, control, and engineering of quantum devices and processes.