论文标题
高保真，高量表性的两分门方案，用于超导Qubit
High-fidelity, high-scalability two-qubit gate scheme for superconducting qubits
论文作者
论文摘要
高质量的两分门操作对于可扩展的量子信息处理至关重要。通常，当系统变得更加集成时，栅极保真度会损害。因此，高度希望的低率率，易于规模的双Quitage Gate方案是非常可取的。在这里，我们在实验上展示了一种新的两分配门方案，该方案利用了超导量子电路中的固定频率和可调耦合器。该方案需要更少的控制线，减少串扰效应，简化校准程序，但在30NS中产生一个受控的-Z门，高忠诚度为99.5％，源自交织的随机基准方法。错误分析表明，门误差大多是连贯的有限的。我们的演示为大规模实施高保真量子操作铺平了道路。
High-quality two-qubit gate operations are crucial for scalable quantum information processing. Often, the gate fidelity is compromised when the system becomes more integrated. Therefore, a low-error-rate, easy-to-scale two-qubit gate scheme is highly desirable. Here, we experimentally demonstrate a new two-qubit gate scheme that exploits fixed-frequency qubits and a tunable coupler in a superconducting quantum circuit. The scheme requires less control lines, reduces crosstalk effect, simplifies calibration procedures, yet produces a controlled-Z gate in 30ns with a high fidelity of 99.5%, derived from the interleaved randomized benchmarking method. Error analysis shows that gate errors are mostly coherence limited. Our demonstration paves the way for large-scale implementation of high-fidelity quantum operations.
