超导量子电路中的硬件高效快速三量子位门

IF 6.5 2区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Xiao-Le Li, Ziyu Tao, Kangyuan Yi, Kai Luo, Libo Zhang, Yuxuan Zhou, Song Liu, Tongxing Yan, Yuanzhen Chen, Dapeng Yu
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引用次数: 0

摘要

虽然将一般量子算法分解为一系列单量子比特和双量子比特门的常见做法在概念上很简单,但在许多情况下,使用具有多个量子比特的量子门可以获得更高效的解决方案。在噪声中量子(NISQ)时代,通用纠错仍然不可用,因此这种策略特别有吸引力,因为它能显著减少执行量子算法所需的计算资源。在这项工作中,我们通过实验研究了超导量子电路上的三量子比特受控CPHASE-SWAP(CCZS)门。通过利用超导量子比特的高能级,我们能够实现持续时间为 40 ns 的类似 Fredkin 的 CCZS 门,这与在同一平台上实现的典型单量子比特和双量子比特门相当。通过对两个目标量子比特进行量子过程层析,我们获得了在∣0〉和∣1〉中制备控制量子比特的过程保真度,分别为86.0%和81.1%。我们还表明,我们的方案可以很容易地扩展到实现具有任意交换角的通用 CCZS 门。本文报告的结果为实现大规模硬件高效量子电路的工具箱提供了宝贵的补充。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Hardware-efficient and fast three-qubit gate in superconducting quantum circuits

Hardware-efficient and fast three-qubit gate in superconducting quantum circuits

While the common practice of decomposing general quantum algorithms into a collection of single- and two-qubit gates is conceptually simple, in many cases it is possible to have more efficient solutions where quantum gates engaging multiple qubits are used. In the noisy intermediate-scale quantum (NISQ) era where a universal error correction is still unavailable, this strategy is particularly appealing since it can significantly reduce the computational resources required for executing quantum algorithms. In this work, we experimentally investigate a three-qubit Controlled-CPHASE-SWAP (CCZS) gate on superconducting quantum circuits. By exploiting the higher energy levels of superconducting qubits, we are able to realize a Fredkin-like CCZS gate with a duration of 40 ns, which is comparable to typical single- and two-qubit gates realized on the same platform. By performing quantum process tomography for the two target qubits, we obtain a process fidelity of 86.0% and 81.1% for the control qubit being prepared in ∣0〉 and ∣1〉, respectively. We also show that our scheme can be readily extended to realize a general CCZS gate with an arbitrary swap angle. The results reported here provide valuable additions to the toolbox for achieving large-scale hardware-efficient quantum circuits.

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来源期刊
Frontiers of Physics
Frontiers of Physics PHYSICS, MULTIDISCIPLINARY-
CiteScore
9.20
自引率
9.30%
发文量
898
审稿时长
6-12 weeks
期刊介绍: Frontiers of Physics is an international peer-reviewed journal dedicated to showcasing the latest advancements and significant progress in various research areas within the field of physics. The journal's scope is broad, covering a range of topics that include: Quantum computation and quantum information Atomic, molecular, and optical physics Condensed matter physics, material sciences, and interdisciplinary research Particle, nuclear physics, astrophysics, and cosmology The journal's mission is to highlight frontier achievements, hot topics, and cross-disciplinary points in physics, facilitating communication and idea exchange among physicists both in China and internationally. It serves as a platform for researchers to share their findings and insights, fostering collaboration and innovation across different areas of physics.
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