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Related Experiment Video

Updated: Feb 22, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Published on: November 30, 2012

Photonic Loschmidt echo in binary waveguide lattices.

|September 29, 2017

Summary

This summary is machine-generated.

Researchers demonstrate a novel method to achieve time reversal for photons in optical waveguide lattices. By swapping lattice sublattices, they induce a Loschmidt echo, reviving the initial photonic state without Hamiltonian reversal.

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Last Updated: Feb 22, 2026

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Area of Science:

Quantum physics
Classical physics
Photonics
Wave phenomena

Background:

Time reversal is a fundamental concept in physics, crucial for observing phenomena like the Loschmidt echo.
Achieving time reversal typically necessitates reversing the system's Hamiltonian, which is experimentally challenging.

Purpose of the Study:

To demonstrate the observation of a Loschmidt echo for photons without reversing the Hamiltonian.
To explore a novel optical method for achieving time reversal in photonic systems.

Main Methods:

Investigating photonic propagation in a binary waveguide lattice.
Implementing a sublattice exchange protocol after a specific propagation distance.
Analyzing Loschmidt echoes for single photon and NOON states in 1D and 2D lattices.

Main Results:

A Loschmidt echo for photons was successfully observed in an optical setting.
The phenomenon was achieved by dynamically altering the waveguide lattice structure (sublattice exchange).
Demonstrated echoes for both single photons and complex NOON states.

Conclusions:

The study presents a practical method for photonic time reversal using waveguide lattice manipulation.
This approach offers a viable alternative to traditional Hamiltonian reversal for observing Loschmidt echoes.
The findings have implications for quantum information processing and fundamental wave physics.