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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Robust Detection of an Entanglement Transition in the Projective Transverse-Field Ising Model.

Felix Roser¹, Etienne M Springer¹, Hans Peter Büchler¹

¹University of Stuttgart, Center for Integrated Quantum Science and Technology, Institute for Theoretical Physics III and , 70550 Stuttgart, Germany.

Physical Review Letters

|April 25, 2026

Summary

We developed a new protocol to detect entanglement transitions in quantum systems, overcoming experimental challenges like noise and measurement randomness. This method provides robust bounds on the transition, useful for quantum simulations.

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Area of Science:

Quantum Information Science
Condensed Matter Physics
Quantum Computing

Background:

Entanglement transitions are critical quantum phenomena but experimentally challenging to detect.
Projective measurements and noise in large-scale quantum systems hinder accurate observation.

Purpose of the Study:

To propose a scalable and noise-resilient protocol for detecting entanglement transitions.
To overcome experimental limitations in observing these transitions.

Main Methods:

Utilized a projective version of the transverse-field Ising model.
Combined error correction algorithms with classical shadow tomography.
Developed a method for experimentally accessible bounds without postselection or full state tomography.

Main Results:

The proposed protocol provides robust upper and lower bounds on the entanglement transition.
These bounds are resilient to noise, a significant improvement for experimental settings.
The sharpness of the bounds serves as a quantitative measure of the noise rate.

Conclusions:

The protocol offers a practical approach for experimentally detecting entanglement transitions.
It provides a noise-resilient method for characterizing quantum phase transitions.
This work advances the experimental observation and understanding of entanglement dynamics.