Universal control of a six-qubit quantum processor in silicon.
Universal control of a six-qubit quantum processor in silicon.
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DOI：
10.1038/s41586-022-05117-x
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发表时间：
2022-09
期刊：
影响因子：
64.8
通讯作者：
Vandersypen, Lieven M. K.
中科院分区：
文献类型：
--
作者：
Philips, Stephan G. J.;Amitonov, Sergey, V;de Snoo, Sander L.;Russ, Maximilian;Kalhor, Nima;Volk, Christian;Lawrie, William I. L.;Brousse, Delphine;Tryputen, Larysa;Wuetz, Brian Paquelet;Sammak, Amir;Veldhorst, Menno;Scappucci, Giordano;Vandersypen, Lieven M. K.
未来能够解决相关问题的量子计算机将需要大量可以可靠运行的量子比特。然而，具有大量子位计数和以高保真度操作的要求通常是冲突的。半导体量子点中的自旋显示出长期的前景，但到目前为止，演示使用1到4个量子位，并且通常优化单量子位或双量子位操作或初始化和读出的保真度。在这里，我们增加了量子位的数量，同时实现了普适操作，状态准备和测量的可观性能。我们设计，制造和操作一个六量子位处理器，专注于仔细的哈密顿工程，对量子电路进行高层次的抽象编程，以及高效的背景校准，所有这些都是在这个扩展系统上实现高精度的关键。状态准备将测量初始化和实时反馈与量子非破坏测量相结合。这些进展将使越来越有意义的量子协议的测试成为可能，并成为迈向大规模量子计算机的主要垫脚石。在28 Si/SiGe量子点阵列中实现了对6个量子位的通用控制，每个量子位的拉比振荡频率为93.5- 98.0%，这意味着高的读出和初始化精度。
Future quantum computers capable of solving relevant problems will require a large number of qubits that can be operated reliably. However, the requirements of having a large qubit count and operating with high fidelity are typically conflicting. Spins in semiconductor quantum dots show long-term promise but demonstrations so far use between one and four qubits and typically optimize the fidelity of either single- or two-qubit operations, or initialization and readout. Here, we increase the number of qubits and simultaneously achieve respectable fidelities for universal operation, state preparation and measurement. We design, fabricate and operate a six-qubit processor with a focus on careful Hamiltonian engineering, on a high level of abstraction to program the quantum circuits, and on efficient background calibration, all of which are essential to achieve high fidelities on this extended system. State preparation combines initialization by measurement and real-time feedback with quantum-non-demolition measurements. These advances will enable testing of increasingly meaningful quantum protocols and constitute a major stepping stone towards large-scale quantum computers. The universal control of six qubits in a 28Si/SiGe quantum dot array is demonstrated, achieving Rabi oscillations for each qubit with visibilities of 93.5–98.0%, implying high readout and initialization fidelities.
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影响因子：
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