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Updated: Oct 16, 2025
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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Two-photon interferences of weak coherent lights
Heonoh Kim1, Osung Kwon2, Han Seb Moon3
1Department of Physics, Pusan National University, Geumjeong-Gu, Busan, 46241, South Korea.
Scientific Reports
|October 16, 2021
Summary
This study explores two-photon interference (TPI) using weak coherent pulses at the single-photon level. Findings clarify TPI physics, crucial for quantum information technologies and quantum communication.
Area of Science:
- Quantum mechanics
- Experimental quantum optics
- Quantum information science
Background:
- Two-photon interference (TPI) is vital for quantum information and communication.
- Recent advances utilize phase-randomized weak coherent states for quantum communication.
- Understanding TPI at the single-photon level is essential.
Purpose of the Study:
- Investigate TPI experiments with weak coherent pulses at the single-photon level.
- Quantitatively analyze TPI results using counting rates and fringe shapes.
- Compare TPI of weak coherent pulses with that of correlated photons.
Main Methods:
- Experimental examination of Hong-Ou-Mandel-type TPI with phase-randomized weak coherent pulses.
- Analysis of single- and coincidence-counting rates.
- Measurement of one- and two-photon interference-fringe shapes.
Main Results:
- Observed interference patterns, including visibility and fringe shapes, are explainable by classical intensity correlation.
- The underlying physics of TPI is interpreted as two-photon state interference at the single-photon level.
- Experimental comparison between TPI of weak coherent pulses and correlated photons was performed.
Conclusions:
- The study provides a comprehensive understanding of two-photon interference for coherent light at the single-photon level.
- This research contributes to the foundational knowledge required for advancing quantum information technologies.
- Clarifies the quantum mechanical interpretation of TPI phenomena observed with classical light sources.
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