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Updated: Nov 23, 2025
07:56
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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Induced transparency by interference or polarization
Changqing Wang1, Xuefeng Jiang1, William R Sweeney2,3,4
1Department of Electrical and Systems Engineering, Washington University, St. Louis, MO 63130.
Summary
Polarization-induced transparency (PIT) in optical systems, distinct from electromagnetically induced transparency (EIT), arises from polarization rotation. This finding offers new ways to control light flow in resonator systems.
Area of Science:
- Optics and Photonics
- Quantum Optics
- Resonator Systems
Background:
- Polarization is key in all-optical analogues of electromagnetically induced transparency (EIT).
- Distinguishing EIT origins from polarization-induced phenomena is challenging for applications like slow light and optical storage.
- Existing systems lack clear differentiation between EIT and polarization effects.
Purpose of the Study:
- To investigate and differentiate the physical origins of polarization-induced transparency (PIT) from EIT.
- To analyze polarization effects in various optical EIT systems.
- To explore the potential of PIT and EIT coexistence for light manipulation.
Main Methods:
- Studying polarization effects in coupled optical resonator systems.
- Analyzing transmission spectra to identify transparency windows.
- Investigating the role of polarization mismatch and rotation in inducing transparency.
Main Results:
- A polarization mismatch between whispering gallery modes can create a transparency window resembling EIT.
- This polarization-induced transparency (PIT) is distinct from EIT, stemming from polarization rotation.
- PIT exhibits a unidirectional feature, unlike traditional EIT.
Conclusions:
- Polarization-induced transparency (PIT) is a phenomenon separate from EIT, driven by polarization rotation.
- The coexistence of PIT and EIT provides novel mechanisms for controlling light in optical resonators.
- This research clarifies fundamental distinctions and offers new avenues for optical device applications.
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