Related Experiment Video
Updated: Jul 23, 2026
12:14
The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
22.0K
Ultra-fast Hong-Ou-Mandel interferometry via temporal filtering
Optics Express
|November 23, 2021
Summary
Researchers generated heralded single photons using spontaneous parametric down-conversion with a 3.2 GHz pump laser. They achieved high-visibility Hong-Ou-Mandel interference, crucial for quantum information processing.
Area of Science:
- Quantum optics
- Photonic quantum information processing
Background:
- Heralded single photons (HSPs) from spontaneous parametric down-conversion (SPDC) are vital for quantum information processing.
- Increasing HSP generation rates while minimizing higher-order pair creation is essential for large-scale experiments.
Purpose of the Study:
- To investigate the impact of high-repetition-rate (GHz) pump lasers on spectral purity for HSP generation.
- To experimentally demonstrate high-visibility quantum interference using HSPs generated with a GHz-repetition-rate pump.
Main Methods:
- Development of a theoretical model to account for detector limitations in high-repetition-rate regimes.
- Experimental generation of HSPs via SPDC using 3.2 GHz mode-locked pump pulses.
- Measurement of Hong-Ou-Mandel interference visibility between two independent HSPs.
Main Results:
- A theoretical model was developed to analyze the effect of pulse identification limitations on spectral purity.
- High-visibility Hong-Ou-Mandel interference was experimentally achieved.
- An interference visibility of 0.88(3) was observed, consistent with theoretical predictions.
Conclusions:
- The study validates a model for HSP generation in high-repetition-rate regimes.
- High-visibility interference demonstrates the feasibility of using GHz-pumped SPDC for quantum information processing.
- The findings support the use of GHz-repetition-rate lasers for efficient, high-quality heralded single photon sources.
