论文标题
QUTRIT随机基准测试
Qutrit randomized benchmarking
论文作者
论文摘要
三元量子处理器比传统量子量量子技术具有显着的计算优势,利用Qutrits(三级系统)中量子信息的编码和处理。要评估和比较此类新兴量子硬件的性能,必须具有适用于高维希尔伯特空间的强大基准测试方法。我们展示了行业标准随机基准测试(RB)协议的扩展,该协议广泛用于量子位,适用于三元量子逻辑。使用超导五QUTRIT处理器,我们发现一个单Qutrit门不在低至$ 2.38 \ times 10^{ - 3} $。通过交织的RB,我们发现此QUTRIT门误差在很大程度上受到天然(值类)门的保真度的限制,并使用同时的RB来充分表征交叉言论。最后,我们将循环基准测试应用于两Qutrit CSUM门,并获得$ 0.82 $的两Qutrit过程保真度。我们的结果展示了一种基于RB的工具,可以表征获得QUTRIT处理器的整体性能,以及一种通用方法来诊断将来的Qudit硬件中的控制错误。
Ternary quantum processors offer significant computational advantages over conventional qubit technologies, leveraging the encoding and processing of quantum information in qutrits (three-level systems). To evaluate and compare the performance of such emerging quantum hardware it is essential to have robust benchmarking methods suitable for a higher-dimensional Hilbert space. We demonstrate extensions of industry standard Randomized Benchmarking (RB) protocols, developed and used extensively for qubits, suitable for ternary quantum logic. Using a superconducting five-qutrit processor, we find a single-qutrit gate infidelity as low as $2.38 \times 10^{-3}$. Through interleaved RB, we find that this qutrit gate error is largely limited by the native (qubit-like) gate fidelity, and employ simultaneous RB to fully characterize cross-talk errors. Finally, we apply cycle benchmarking to a two-qutrit CSUM gate and obtain a two-qutrit process fidelity of $0.82$. Our results demonstrate a RB-based tool to characterize the obtain overall performance of a qutrit processor, and a general approach to diagnose control errors in future qudit hardware.