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Related Experiment Video

Updated: Aug 6, 2025

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

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Published on: September 5, 2019

Genuine Tripartite Non-Gaussian Entanglement.

Da Zhang¹, David Barral², Yanpeng Zhang³

¹School of Physics and Information Engineering, Shanxi Normal University, Taiyuan 030031, China.

Physical Review Letters

|March 17, 2023

Summary

Triple-photon states are key for quantum advantage. New criteria reveal these non-Gaussian states are fully entangled, enabling advanced quantum information protocols.

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Area of Science:

Quantum optics
Quantum information theory
Non-Gaussian states

Background:

Triple-photon states, generated via three-mode spontaneous parametric down-conversion, are crucial unconditional non-Gaussian states.
Characterizing the non-Gaussian entanglement of these states is essential for quantum advantage but remains challenging.

Purpose of the Study:

To develop a systematic framework for characterizing the entanglement of triple-photon states.
To establish sufficient and necessary conditions for separability and genuine tripartite non-Gaussian entanglement.

Main Methods:

Derivation of novel criteria for separability of non-Gaussian states.
Development of state-of-the-art conditions for genuine tripartite non-Gaussian entanglement.
Application of these criteria to triple-photon states.

Main Results:

Proposed sufficient and necessary conditions for separability of spontaneously generated three-mode non-Gaussian states.
Derived conditions for genuine tripartite non-Gaussian entanglement.
Demonstrated that triple-photon states are fully inseparable and genuinely entangled in moments of order 3n.

Conclusions:

Established a systematic framework for characterizing triple-photon state entanglement.
The findings facilitate the application of triple-photon states in quantum information protocols.
This work advances the understanding and utilization of non-Gaussian states in quantum technologies.