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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Deterministic delivery of remote entanglement on a quantum network
Peter C Humphreys1, Norbert Kalb1, Jaco P J Morits1
1QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands.
Nature
|June 15, 2018
Summary
Researchers developed a high-rate entanglement protocol for quantum networks. This breakthrough enables deterministic remote entanglement generation, a crucial step for secure communication and distributed quantum computing.
Area of Science:
- Quantum Information Science
- Quantum Networking
- Quantum Communication
Background:
- Large-scale quantum networks require high entanglement generation rates between nodes to overcome decoherence.
- Current two-node quantum networks face limitations in entanglement distribution efficiency.
- Deterministic remote entanglement is essential for advanced quantum applications.
Purpose of the Study:
- To demonstrate a high-rate, deterministic entanglement protocol for scalable quantum networks.
- To exceed the entanglement generation rate beyond the decoherence rate for remote nodes.
- To establish a key building block for future multi-node quantum networks.
Main Methods:
- Utilized diamond spin qubit nodes separated by two meters.
- Implemented a fully heralded single-photon entanglement protocol.
- Employed dynamical decoupling to suppress decoherence rates of entangled states.
Main Results:
- Achieved entanglement generation rates up to 39 Hz, three orders of magnitude higher than previous methods.
- Suppressed remote entangled state decoherence rate to 5 Hz.
- Demonstrated deterministic delivery of remote entangled states with >0.5 fidelity every 100 ms.
Conclusions:
- The developed protocol overcomes key limitations in entanglement distribution for quantum networks.
- This work provides a critical component for building extended, multi-node quantum networks.
- Enables secure communication, distributed quantum computing, and enhanced sensing via entanglement distribution.
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