Qubit teleportation between non-neighbouring nodes in a quantum network.
Qubit teleportation between non-neighbouring nodes in a quantum network.
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DOI：
10.1038/s41586-022-04697-y
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发表时间：
2022-05
期刊：
影响因子：
64.8
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中科院分区：
文献类型：
--
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未来的量子互联网应用将从跨网络共享量子信息的能力中获得力量。量子隐形传态允许在遥远的节点之间可靠地传输量子信息，即使在存在高损耗网络连接的情况下。尽管已经在不同的量子网络平台上进行了许多实验演示，但到目前为止，超越直接连接的节点一直受到对预共享远程纠缠，联合量子比特读出和相干时间的苛刻要求的阻碍。在这里，我们实现了量子网络中远程非相邻节点之间的量子隐形传态。该网络使用三个基于固态自旋量子位的光学连接节点。通过在两个链路上建立远程纠缠，然后在中间节点上进行纠缠交换并存储在存储器量子位中来准备传送器。我们证明，一旦成功准备的传送器是预示着，任意量子比特状态可以传送的保真度以上的经典界，甚至单位效率。这些结果是通过量子比特读出过程中的关键创新，纠缠生成期间的主动存储量子比特保护以及减少远程纠缠不确定性的定制预告实现的。我们的工作展示了未来量子网络的主要构建模块，并为探索基于远程传输的多节点协议和应用打开了大门。由三个包含固态量子比特的光学连接节点形成的量子网络演示了两个非相邻节点之间量子信息的隐形传态，从而消除了它们之间直接连接的需要。
Future quantum internet applications will derive their power from the ability to share quantum information across the network. Quantum teleportation allows for the reliable transfer of quantum information between distant nodes, even in the presence of highly lossy network connections. Although many experimental demonstrations have been performed on different quantum network platforms, moving beyond directly connected nodes has, so far, been hindered by the demanding requirements on the pre-shared remote entanglement, joint qubit readout and coherence times. Here we realize quantum teleportation between remote, non-neighbouring nodes in a quantum network. The network uses three optically connected nodes based on solid-state spin qubits. The teleporter is prepared by establishing remote entanglement on the two links, followed by entanglement swapping on the middle node and storage in a memory qubit. We demonstrate that, once successful preparation of the teleporter is heralded, arbitrary qubit states can be teleported with fidelity above the classical bound, even with unit efficiency. These results are enabled by key innovations in the qubit readout procedure, active memory qubit protection during entanglement generation and tailored heralding that reduces remote entanglement infidelities. Our work demonstrates a prime building block for future quantum networks and opens the door to exploring teleportation-based multi-node protocols and applications. A quantum network formed by three optically connected nodes comprising solid-state qubits demonstrates the teleportation of quantum information between two non-neighbouring nodes, negating the need for a direct connection between them.
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