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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Related Experiment Video

Updated: May 10, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

An optimized photon pair source for quantum circuits.

Georg Harder1, Vahid Ansari, Benjamin Brecht

  • 1Applied Physics, University of Paderborn, Warburger Strasse 100, 33098 Paderborn, Germany. georg.harder@uni-paderborn.de

Optics Express
|June 22, 2013
PubMed
Summary
This summary is machine-generated.

We developed an ultrafast pulsed source for generating high-quality photon pairs at telecommunication wavelengths. This source produces indistinguishable photons with high purity, crucial for quantum communication applications.

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Last Updated: May 10, 2026

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Area of Science:

  • Quantum optics
  • Photonics
  • Nonlinear optics

Background:

  • Developing efficient sources of indistinguishable photon pairs is critical for advancing quantum technologies.
  • Existing sources often struggle with spectral distinguishability and low purity, limiting their practical applications.

Purpose of the Study:

  • To implement an ultrafast pulsed type-II parametric down conversion source in a periodically poled KTP waveguide.
  • To generate photon pairs with nearly identical signal and idler properties at telecommunication wavelengths.
  • To characterize the indistinguishability and purity of the generated heralded single photons.

Main Methods:

  • Utilized type-II spontaneous parametric down conversion in a periodically poled potassium titanyl phosphate (KTP) waveguide.
  • Measured joint spectral intensity distribution and second-order correlation functions.
  • Performed Hong-Ou-Mandel interference experiments between signal and idler photons, and with coherent fields.

Main Results:

  • Achieved a low effective mode number (Schmidt number < 1.16) indicating high indistinguishability.
  • Demonstrated Hong-Ou-Mandel interference visibility of 94.8% without narrowband filtering.
  • Determined heralded single photon purity exceeding 80%.
  • Measured raw heralding efficiencies of 20.5% (signal) and 15.5% (idler), with detector-loss corrected values of 80% and 70% respectively.

Conclusions:

  • The implemented source closely resembles a pure, genuine single-mode photon pair source with indistinguishable modes.
  • The high purity and indistinguishability achieved make these heralded single photons suitable for quantum information processing and communication.
  • The source demonstrates a promising platform for generating high-quality quantum states at telecommunication wavelengths.