arXiv Open Access 2025

A metropolitan-scale trapped-ion quantum network node with hybrid multiplexing enhancements

Z. -B. Cui Z. -Q. Wang P. -C. Lai Y. Wang J. -X. Shi +11 lainnya
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Abstrak

Quantum network and quantum repeater are promising ways to scale up a quantum information system to enable various applications with unprecedented performance. As a current bottleneck of building a long-distance quantum network, the distribution rate of heralded entanglement between remote network nodes is typically much lower than the decoherence rate of each local node, which obstructs the implementation of a metropolitan-scale quantum network with more than two remote nodes. A promising scheme to accelerate the remote entanglement distribution is through multiplexing enhancement based on a multimode quantum network node. In this work, we experimentally realize a functional $5$-ion quantum network node with two different types of qubits inside. We employ a hybrid multiplexing scheme combining the methods of multiple excitation and ion shuttling, in which maximally $44$ time-bin modes are generated and sent through a long fiber to boost the entangling rate. Via this scheme, we can generate heralded ion-photon entanglement with a high fidelity of $96.8\%$/$94.6\%$/$89.8\%$ with a success rate of $263\,\text{s}^{-1}$/$40\,\text{s}^{-1}$/$4.28\,\text{s}^{-1}$, over a fiber of $3\,$m/$1\,$km/$12\,$km, respectively. In addition, the memory qubit can protect the stored quantum information from the destructive ion-photon entangling attempts via dual-type encoding and a memory coherence time of $366\,$ms is achieved. This coherence time has exceeded the expected entanglement generation time $234\,$ms over a $12\,$km fiber, which is realized for the first time in a metropolitan-scale quantum network node.

Topik & Kata Kunci

Penulis (16)

Z

Z. -B. Cui

Z

Z. -Q. Wang

P

P. -C. Lai

Y

Y. Wang

J

J. -X. Shi

P

P. -Y. Liu

Y

Y. -D. Sun

Z

Z. -C. Tian

Y

Y. -B. Liang

B

B. -X. Qi

Y

Y. -Y. Huang

Z

Z. -C. Zhou

Y

Y. -K. Wu

Y

Y. Xu

L

L. -M. Duan

Y

Y. -F. Pu

Format Sitasi

Cui, Z.-., Wang, Z.-., Lai, P.-., Wang, Y., Shi, J.-., Liu, P.-. et al. (2025). A metropolitan-scale trapped-ion quantum network node with hybrid multiplexing enhancements. https://arxiv.org/abs/2503.13898

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Tahun Terbit
2025
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en
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arXiv
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Open Access ✓