Multiplexed quantum repeaters based on dual-species trapped-ion systems
Multiplexed quantum repeaters based on dual-species trapped-ion systems
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DOI：
10.1103/physreva.105.022623
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发表时间：
2021-05
影响因子：
2.9
通讯作者：
Prajit Dhara;N. Linke;E. Waks;S. Guha;K. Seshadreesan
中科院分区：
文献类型：
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作者：
Prajit Dhara;N. Linke;E. Waks;S. Guha;K. Seshadreesan
捕获的离子形成了一个先进的技术平台，用于量子信息处理，以长量子的相干时间，高保真量子逻辑门，光学活跃的速度和尺寸扩展的潜力，同时保持量子之间的高度连接水平。这些特征使它们不仅对量子计算，而且对量子网络具有吸引力。专用的，专用的用途捕获 - 离子处理器与合适的互连硬件结合使用，可用于形成量子中继器，以在网络中的遥远的捕获式ION量子计算机之间实现高速量子通信。在这方面，具有两种不同种子物种的混合陷阱，其中一种离子物种可以产生离子 - 光子纠缠，这些纠缠对于与网络的光学接口有用，而另一个具有长期记忆寿命，对量子存储有用，用于纠缠分配。我们考虑基于此类双物种被困的离子系统的中继器的架构。我们建议并分析基于空间和时间模式多路复用的协议，以在此类中继器的线网络上进行纠缠分布。与以前报告的中继器报道的利率相比，我们的协议提供了提高的利率。我们确定中继器所需的离子资源以达到提高利率，当对中继器数量和每个中继器的离子数量放置时，可以达到最佳利率。我们的结果加强了近期被困离子系统作为长距离量子通信的量子中继器的案例。
Trapped ions form an advanced technology platform for quantum information processing with long qubit coherence times, high-fidelity quantum logic gates, optically active qubits, and a potential to scale up in size while preserving a high level of connectivity between qubits. These traits make them attractive not only for quantum computing but also for quantum networking. Dedicated, special-purpose trapped-ion processors in conjunction with suitable interconnecting hardware can be used to form quantum repeaters that enable high-rate quantum communications between distant trapped-ion quantum computers in a network. In this regard, hybrid traps with two distinct species of ions, where one ion species can generate ion-photon entanglement that is useful for optically interfacing with the network and the other has long memory lifetimes, useful for qubit storage, have been proposed for entanglement distribution. We consider an architecture for a repeater based on such dual-species trapped-ion systems. We propose and analyze a protocol based on spatial and temporal mode multiplexing for entanglement distribution across a line network of such repeaters. Our protocol offers enhanced rates compared to rates previously reported for such repeaters. We determine the ion resources required at the repeaters to attain the enhanced rates, and the best rates attainable when constraints are placed on the number of repeaters and the number of ions per repeater. Our results bolster the case for near-term trapped-ion systems as quantum repeaters for long-distance quantum communications.