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Quantifying the momentum correlation between two light beams by detecting one.

Armin Hochrainer1,2, Mayukh Lahiri3,2, Radek Lapkiewicz3,2

  • 1Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, Vienna A-1090, Austria; anton.zeilinger@univie.ac.at armin.hochrainer@univie.ac.at.

Proceedings of the National Academy of Sciences of the United States of America
|February 2, 2017
PubMed
Summary
This summary is machine-generated.

Researchers measured photon momentum correlation by detecting just one photon. This technique uses induced coherence to analyze interference patterns, potentially characterizing entangled photon sources and measuring continuous variable entanglement.

Keywords:
complementarity principlephoton indistinguishabilityphotonic spatial modesquantum correlationssingle-photon interference

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Area of Science:

  • Quantum optics
  • Photonics
  • Quantum information science

Background:

  • Photon momentum correlations are crucial for quantum communication.
  • Characterizing entangled photon sources is essential for quantum technologies.
  • Measuring continuous variable entanglement typically requires detecting both entangled particles.

Purpose of the Study:

  • To develop a method for measuring transverse momentum correlation between two photons by detecting only one.
  • To explore the use of induced coherence without induced emission for photon correlation measurements.
  • To assess the potential for measuring continuous variable entanglement with single-particle detection.

Main Methods:

  • Utilized two identical photon sources in a specific arrangement.
  • Observed the phenomenon of induced coherence without induced emission.
  • Generated an interference pattern in the superposition of one beam from each source.
  • Quantified transverse momentum correlation by analyzing interference pattern visibility.

Main Results:

  • Successfully measured transverse momentum correlation by detecting single photons.
  • Demonstrated a method based on induced coherence and interference pattern analysis.
  • Established a link between interference pattern visibility and momentum correlation.

Conclusions:

  • The developed method enables characterization of correlated photon pair sources.
  • This approach offers a potential pathway for experimental measurement of continuous variable entanglement.
  • Single-particle detection simplifies the measurement of entanglement properties.