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Measurement-induced photonic topological insulators.

Quancheng Liu¹, Weijie Liu¹, Yuechen Jia¹

¹School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.

Science Advances

|July 18, 2025

Summary

This summary is machine-generated.

Researchers dynamically modified topological order in photonic lattices using repeated measurements. This study reveals measurements as a universal control tool for tailoring topological properties in photonic systems.

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Area of Science:

Photonics
Quantum Mechanics
Condensed Matter Physics

Background:

Topological order in photonics is typically static, defined by pseudo-spin.
Quantum measurements inherently alter system states.
The interplay between measurement and topology in photonics is an underexplored area.

Purpose of the Study:

To investigate the dynamic modification of topological order in photonic systems.
To explore the use of repeated measurements as a tool for controlling topological properties.
To establish a platform for simulating measurement backaction in photonic lattices.

Main Methods:

Fabrication of a photonic lattice using contiguous waveguides and 16,800 appended waveguide segments.
Establishment of a classical-wave platform to simulate measurement backaction.
Experimental validation of measurement-induced topological order and universal lattice control.

Main Results:

Demonstrated dynamic modification of topological order through repeated measurements.
Observed measurement-induced topological order in photonic lattices.
Showcased universal control of the photonic lattice by tailoring its Hilbert space via measurements.

Conclusions:

Topological order in photonics can be dynamically controlled by measurements.
Measurements serve as a universal tool for controlling photonic lattice properties.
This research paves the way for on-chip topological materials and measurement-induced photonic control.