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Potential Due to a Polarized Object01:29

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Polarization-entangled photon generation using partial spatially coherent pump beam.

Yaseera Ismail1, Stuti Joshi2, Francesco Petruccione2,3

  • 1University of KwaZulu-Natal, School of Chemistry and Physics, Quantum Research Group, Durban, 4000, South Africa. Ismaily@ukzn.ac.za.

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Summary
This summary is machine-generated.

Researchers explored how pump beam spatial coherence affects polarization-entangled photon pair generation. Partially coherent beams enhance visibility, crucial for quantum communication.

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Area of Science:

  • Quantum optics
  • Free-space quantum communication

Background:

  • Two-photon field generation typically uses fully coherent pump beams.
  • Spatial coherence of pump beams is a critical parameter in quantum optics.

Purpose of the Study:

  • To theoretically and experimentally demonstrate polarization-entangled single photon pair generation by varying pump beam spatial coherence.
  • To investigate the impact of pump beam spatial coherence on the visibility of entangled photon sources.

Main Methods:

  • Generating polarization-entangled single photon pairs using pump beams with varying spatial coherence.
  • Measuring and comparing the visibility of the entangled photon source with fully coherent and partially coherent pump beams.

Main Results:

  • Demonstrated the generation of polarization-entangled single photon pairs by manipulating pump beam spatial coherence.
  • Observed an increase in visibility when using a partially coherent pump beam compared to a fully coherent one.
  • Quantified the effect of pump beam spatial coherence on entanglement visibility.

Conclusions:

  • Partial coherence of the pump beam enhances the visibility of polarization-entangled single photon sources.
  • The coherence properties of the pump beam are significant for optimizing free-space optical transmission.
  • Findings are particularly relevant for advancing long-range free-space quantum communication technologies.