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Non-Abelian Braiding of Light
Thomas Iadecola1, Thomas Schuster1, Claudio Chamon1
1Physics Department, Boston University, Boston, Massachusetts 02215, USA.
Physical Review Letters
|August 27, 2016
Summary
Researchers demonstrate non-Abelian Berry phases in photonic systems. Coherent light injected into topological guided modes exhibits braiding, leading to order-dependent phase accumulation without light quantization.
Area of Science:
- Topological photonics
- Quantum optics
- Wave phenomena
Background:
- Topological phenomena, initially studied in electronic systems, are now observed in photonics and acoustics.
- Topological guided modes in photonic waveguide arrays are analogues of electronic topological zero modes.
Purpose of the Study:
- To demonstrate the emergence of non-Abelian Berry phases in photonic systems.
- To explore the braiding of light within topological guided modes.
- To show these phenomena can be understood as classical wave effects.
Main Methods:
- Injection of coherent light states into specially fabricated photonic waveguide arrays.
- Observation of light traveling within spatially separated topological guided modes.
- Analysis of phase accumulation based on the order of beam winding.
Main Results:
- Demonstration of non-Abelian Berry phases arising from the braiding of light in topological guided modes.
- The observed effects persist even at high photon occupation numbers.
- These phenomena are consistent with classical wave optics derived from Maxwell's equations.
Conclusions:
- Non-Abelian Berry phases can be realized and controlled in photonic systems.
- The braiding of light in topological modes offers a novel platform for studying topological physics.
- An optical interference experiment is proposed to directly probe this non-Abelian braiding.
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