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Nonlocal photonic quantum gates over 7.0 km.
Xiao Liu1,2, Xiao-Min Hu1,2,3, Tian-Xiang Zhu1,2
1CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, 230026, China.
Nature Communications
|October 2, 2024
Summary
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.
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.
