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

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

URL: http://arxiv.org/abs/2503.13898v1
Date: Tue, 18 Mar 2025 04:51:05 GMT
Title: A metropolitan-scale trapped-ion quantum network node with hybrid multiplexing enhancements
Authors: Z. -B. Cui, Z. -Q. Wang, P. -C. Lai, Y. Wang, J. -X. Shi, P. -Y. Liu, Y. -D. Sun, Z. -C. Tian, Y. -B. Liang, B. -X. Qi, Y. -Y. Huang, Z. -C. Zhou, Y. -K. Wu, Y. Xu, L. -M. Duan, Y. -F. Pu,
Abstract summary: We experimentally realize a functional $5$-ion quantum network node with two different types of qubits inside.<n>We can generate heralded ion-photon entanglement with a high fidelity of $96.8%$/$94.6%$/$89.8%$ with a success rate of $263,texts-1$/$40,texts-1$/$4.28,texts-1$, over a fiber of $3,$m/$1,$km/$12,$km, respectively.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: 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.

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