论文标题

QUTRIT随机基准测试

Qutrit randomized benchmarking

论文作者

Morvan, A., Ramasesh, V. V., Blok, M. S., Kreikebaum, J. M., O'Brien, K., Chen, L., Mitchell, B. K., Naik, R. K., Santiago, D. I., Siddiqi, I.

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.

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