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Related Experiment Video

Updated: Jun 11, 2025

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Nonlocal photonic quantum gates over 7.0 km.

Xiao Liu^1,2, Xiao-Min Hu^1,2,3, Tian-Xiang Zhu^1,2

¹CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, 230026, China.

Nature Communications

|October 2, 2024

Summary

This summary is machine-generated.

Researchers demonstrated nonlocal quantum gates between two nodes 7.0 km apart using quantum memories and fiber optics. This breakthrough enables large-scale distributed quantum computing over metropolitan distances.

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Last Updated: Jun 11, 2025

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Area of Science:

Quantum Information Science
Quantum Networking
Quantum Computing

Background:

Quantum networks require long-distance entanglement and qubit control for distributed quantum computing.
Current nonlocal quantum gates are limited to short distances (tens of meters).

Purpose of the Study:

To demonstrate nonlocal photonic quantum gates over metropolitan-scale distances (7.0 km).
To establish foundational elements for large-scale distributed quantum networks.

Main Methods:

Utilized stationary qubits in multiplexed quantum memories.
Employed flying qubits at telecom wavelengths.
Implemented active feedforward control over field-deployed optical fibers.

Main Results:

Successfully demonstrated nonlocal quantum gates between nodes separated by 7.0 km.
Implemented quantum parallelism via the Deutsch-Jozsa and quantum phase estimation algorithms remotely.

Conclusions:

Proof-of-principle for quantum gates over metropolitan distances.
Lays the groundwork for large-scale quantum networks using existing fiber infrastructure.