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Measuring the Joint Spectral Mode of Photon Pairs Using Intensity Interferometry.

G S Thekkadath1,2, B A Bell1, R B Patel1,3

  • 1Department of Physics, Imperial College London, Prince Consort Road, London SW7 2AZ, United Kingdom.

Physical Review Letters
|January 28, 2022
PubMed
Summary
This summary is machine-generated.

We developed a simple intensity interferometry method to measure the joint spectral mode of quantum light. This technique aids in creating high-purity quantum light sources for advanced applications.

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Area of Science:

  • Quantum Optics
  • Quantum Information Science

Background:

  • Manipulating quantum light's time-frequency structure is crucial for quantum information processing and metrology.
  • Measuring the spectral structure of quantum light sources is vital for ensuring high modal purity and enabling interference with independent sources.

Purpose of the Study:

  • To present and experimentally demonstrate a novel scheme for measuring the joint spectral mode of photon pairs.
  • To investigate spectral phase correlations arising from pump chirp.
  • To show the scheme's compatibility with stimulated emission tomography for rapid modal analysis.

Main Methods:

  • Utilized intensity interferometry to measure the joint spectral mode of photon pairs from spontaneous parametric down-conversion.
  • Observed spectral phase correlations attributed to pump chirp.
  • Demonstrated combination with stimulated emission tomography for efficient modal measurement.

Main Results:

  • Successfully measured the joint spectral mode of photon pairs.
  • Identified and characterized spectral phase correlations linked to pump chirp.
  • Showcased a method for rapid modal measurement using classical light.

Conclusions:

  • The presented intensity interferometry scheme offers a simple and effective method for measuring the modal structure of quantum light.
  • The technique does not necessitate phase stability, nonlinearities, or spectral shaping, simplifying experimental implementation.
  • This approach facilitates the development of quantum light sources with improved modal purity for quantum technologies.