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Tailoring Photon Statistics with an Atom-Based Two-Photon Interferometer.

Martin Cordier1, Max Schemmer1, Philipp Schneeweiss1

  • 1Department of Physics, Humboldt-Universität zu Berlin, 10099 Berlin, Germany.

Physical Review Letters
|November 17, 2023
PubMed
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Researchers controlled photon statistics by tuning quantum phase between laser light and scattered photons. This tunable quantum interference modifies photon emission from single photons to photon pairs, enabling new quantum light sources.

Area of Science:

  • Quantum Optics
  • Quantum Information Science

Background:

  • Controlling photon statistics is crucial for quantum technologies.
  • Quantum interference between laser light and scattered photons can alter photon emission.

Purpose of the Study:

  • To actively control the quantum phase between coherent laser light and incoherently scattered photons.
  • To realize a tunable two-photon interferometer and modify photon statistics.

Main Methods:

  • Utilizing the dispersion of an atomic medium to control quantum phase.
  • Observing interference fringes in the normalized photon coincidence rate.
  • Tuning the relative phase to modify photon statistics.

Main Results:

  • Demonstrated a tunable two-photon interferometer.

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  • Observed periodic variations in photon coincidence rate with phase tuning.
  • Achieved continuous modification of photon statistics from antibunching to bunching.

    • Conclusions:

    • A tunable quantum phase exists between incoherent and coherent light, dictating photon statistics.
    • Results provide fundamental insights into quantum light manipulation.
    • The developed method can lead to novel quantum light sources.