Universal control of four singlet–triplet qubits

IF 38.1 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xin Zhang, Elizaveta Morozova, Maximilian Rimbach-Russ, Daniel Jirovec, Tzu-Kan Hsiao, Pablo Cova Fariña, Chien-An Wang, Stefan D. Oosterhout, Amir Sammak, Giordano Scappucci, Menno Veldhorst, Lieven M. K. Vandersypen
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引用次数: 0

Abstract

The coherent control of interacting spins in semiconductor quantum dots is of strong interest for quantum information processing and for studying quantum magnetism from the bottom up. Here we present a 2 × 4 germanium quantum dot array with full and controllable interactions between nearest-neighbour spins. As a demonstration of the level of control, we define four singlet–triplet qubits in this system and show two-axis single-qubit control of each qubit and SWAP-style two-qubit gates between all neighbouring qubit pairs, yielding average single-qubit gate fidelities of 99.49(8)–99.84(1)% and Bell state fidelities of 73(1)–90(1)%. Combining these operations, we experimentally implement a circuit designed to generate and distribute entanglement across the array. A remote Bell state with a fidelity of 75(2)% and concurrence of 22(4)% is achieved. These results highlight the potential of singlet–triplet qubits as a competing platform for quantum computing and indicate that scaling up the control of quantum dot spins in extended bilinear arrays can be feasible.

Abstract Image

对四个单三重子量子比特的通用控制
对半导体量子点中相互作用的自旋进行相干控制,对于量子信息处理和自下而上地研究量子磁性具有重大意义。在这里,我们展示了一个 2 × 4 锗量子点阵列,其近邻自旋之间的相互作用是完全可控的。作为控制水平的演示,我们在该系统中定义了四个单三重量子比特,并展示了对每个量子比特的双轴单量子比特控制以及所有相邻量子比特对之间的 SWAP 式双量子比特门,其平均单量子比特门保真度为 99.49(8)-99.84(1)% ,贝尔态保真度为 73(1)-90(1)% 。结合这些操作,我们在实验中实现了一种电路,旨在生成和分配整个阵列的纠缠。远程贝尔态的保真度达到 75(2)%,一致性达到 22(4)%。这些结果凸显了单三元量子比特作为量子计算竞争平台的潜力,并表明在扩展的双线性阵列中扩大量子点自旋的控制是可行的。
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来源期刊
Nature nanotechnology
Nature nanotechnology 工程技术-材料科学:综合
CiteScore
59.70
自引率
0.80%
发文量
196
审稿时长
4-8 weeks
期刊介绍: Nature Nanotechnology is a prestigious journal that publishes high-quality papers in various areas of nanoscience and nanotechnology. The journal focuses on the design, characterization, and production of structures, devices, and systems that manipulate and control materials at atomic, molecular, and macromolecular scales. It encompasses both bottom-up and top-down approaches, as well as their combinations. Furthermore, Nature Nanotechnology fosters the exchange of ideas among researchers from diverse disciplines such as chemistry, physics, material science, biomedical research, engineering, and more. It promotes collaboration at the forefront of this multidisciplinary field. The journal covers a wide range of topics, from fundamental research in physics, chemistry, and biology, including computational work and simulations, to the development of innovative devices and technologies for various industrial sectors such as information technology, medicine, manufacturing, high-performance materials, energy, and environmental technologies. It includes coverage of organic, inorganic, and hybrid materials.
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