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Updated: Nov 30, 2025
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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
Published on: August 30, 2012
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Summary
The Hong-Ou-Mandel (HOM) effect in coupled waveguide beam splitters differs from conventional theory. Even identical photons may show reduced interference visibility, impacting quantum optics designs.
Area of Science:
- Quantum Optics
- Quantum Information Science
Background:
- The Hong-Ou-Mandel (HOM) effect is a cornerstone of quantum optics, typically demonstrated with conventional beam splitters.
- It is commonly assumed that HOM interference in coupled waveguide beam splitters follows similar theoretical principles.
Purpose of the Study:
- To investigate the theoretical framework of HOM interference when beam splitters are realized as coupled waveguides.
- To determine if the established theory for conventional beam splitters accurately describes HOM interference in coupled waveguide systems.
Main Methods:
- Theoretical analysis of photon interference within coupled waveguide structures.
- Derivation of HOM interference visibility for identical photons in this specific configuration.
Main Results:
- The theory of HOM interference in coupled waveguide beam splitters can significantly deviate from the conventional understanding.
- Visibility (V) of HOM interference can be substantially less than unity, even for indistinguishable photons.
Conclusions:
- The established theory for conventional beam splitters is insufficient for describing HOM interference in coupled waveguide systems.
- Quantum optical schemes utilizing coupled waveguides as beam splitters require a revised theoretical approach to accurately predict HOM interference outcomes.
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