论文标题
带超导码头的量子插座和基于Demuxyz的门
The Quantum Socket and DemuXYZ-Based Gates with Superconducting Qubits
论文作者
论文摘要
构建大型超导量子计算机需要两个免费元素：可扩展的接线技术和多重架构。在我们以前的工作中[Béjanin等人，物理学。 Rev. Applied 6，044010（2016）]，我们介绍并表征了一个真正的垂直互连，名为量子插座。在本文中，我们使用高氧化通量固定XMON Transmon Qubits锻炼量子插座。特别是，我们测试了潜在的量子加热和一分门的性能。我们观察到没有加热效果和超过99.9％的时稳定闸门保真度。然后，我们提出并通过实验表征基于通量脉冲和常见的连续驱动信号的反复传递的栅极技术：Demuxyz。我们讨论了Demuxyz的工作原理，显示其操作，并在选择一分门的选择上执行量子过程断层扫描以确认正确的操作。我们获得约93％左右的保真度，可能会受到渗透渗透瑕疵的限制。我们终于讨论了接线集成的未来解决方案以及对Demuxyz技术的改进。
Building large-scale superconducting quantum computers requires two complimentary elements: scalable wiring techniques and multiplex architectures. In our previous work [Béjanin et al., Phys. Rev. Applied 6, 044010 (2016)], we have introduced and characterized a truly vertical interconnect named the quantum socket. In this paper, we exercise the quantum socket using high-coherence flux-tunable Xmon transmon qubits. In particular, we test potential qubit heating and one-qubit gate performance. We observe no heating effects and time-stable gate fidelities in excess of 99.9%. We then propose and experimentally characterize a demultiplexed gate technique based on flux pulses and a common continuous drive signal: DemuXYZ. We discuss DemuXYZ's working principle, show its operation, and perform quantum process tomography on a selection of one-qubit gates to confirm proper operation. We obtain fidelities around 93% likely limited by flux-pulse imperfections. We finally discuss future solutions for wiring integration as well as improvements to the DemuXYZ technique.
