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Related Experiment Video

Updated: Nov 16, 2025

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

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

Published on: September 5, 2019

Deterministic multi-qubit entanglement in a quantum network.

Youpeng Zhong^1,2, Hung-Shen Chang¹, Audrey Bienfait^1,3

¹Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL, USA.

|February 25, 2021

Summary

This summary is machine-generated.

Researchers developed a quantum network linking superconducting quantum processors. This breakthrough enables deterministic multi-qubit entanglement distribution, crucial for scalable quantum computing and communication networks.

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Area of Science:

Quantum Information Science
Quantum Computing
Quantum Communication Networks

Background:

High-fidelity distributed multi-qubit entanglement is essential for quantum networks.
Previous deterministic entanglement demonstrations were limited to two qubits.
Challenges in state-transfer fidelity hindered multi-qubit entanglement distribution.

Purpose of the Study:

To demonstrate deterministic transfer of quantum states between superconducting quantum nodes.
To prepare and transfer multi-qubit entangled states, specifically Greenberger-Horne-Zeilinger (GHZ) states.
To establish a modular architecture for large-scale quantum computing.

Main Methods:

Constructed a quantum network with two superconducting nodes connected by a coaxial cable.
Each node contained three interconnected superconducting qubits.
Implemented direct qubit-to-qubit state transfer via the connecting cable.

Main Results:

Achieved a state transfer process fidelity of 0.911 ± 0.008 between nodes.
Successfully transferred a three-qubit GHZ state with 0.656 ± 0.014 fidelity.
Generated a six-qubit, two-node GHZ state with 0.722 ± 0.021 fidelity, exceeding the multipartite entanglement threshold.

Conclusions:

The developed quantum network architecture enables coherent linking of superconducting quantum processors.
Demonstrated deterministic multi-qubit entanglement distribution over a physical link.
Provides a viable modular approach for constructing large-scale quantum computers.