Operation of a silicon quantum processor unit cell above one kelvin

doi:10.1038/s41586-020-2171-6

GSTDTAP > 地球科学

DOI	10.1038/s41586-020-2171-6
	Operation of a silicon quantum processor unit cell above one kelvin
	Han, Kyuho 1; Pierce, Sarah E.2; Li, Amy 1; Spees, Kaitlyn 1; Anderson, Grace R.1; Seoane, Jose A.3,4; Lo, Yuan-Hung 3; Dubreuil, Michael 1,2; Olivas, Micah 1; Kamber, Roarke A.1; Wainberg, Michael 5; Kostyrko, Kaja 6; Kelly, Marcus R.2; Yousefi, Maryam 1; Simpkins, Scott W.1; Yao, David 1
	2020-03-11
发表期刊	NATURE
ISSN	0028-0836
EISSN	1476-4687
出版年	2020
卷号	580 期号:7803 页码:350-+
文章类型	Article
语种	英语
国家	Australia; Canada; Finland; Japan
英文关键词	Quantum computers are expected to outperform conventional computers in several important applications, from molecular simulation to search algorithms, once they can be scaled up to large numbers-typically millions-of quantum bits (qubits)(1-3). For most solid-state qubit technologies-for example, those using superconducting circuits or semiconductor spins-scaling poses a considerable challenge because every additional qubit increases the heat generated, whereas the cooling power of dilution refrigerators is severely limited at their operating temperature (less than 100 millikelvin)(4-6). Here we demonstrate the operation of a scalable silicon quantum processor unit cell comprising two qubits confined to quantum dots at about 1.5 kelvin. We achieve this by isolating the quantum dots from the electron reservoir, and then initializing and reading the qubits solely via tunnelling of electrons between the two quantum dots(7-9). We coherently control the qubits using electrically driven spin resonance(10,11) in isotopically enriched silicon(12 28)Si, attaining single-qubit gate fidelities of 98.6 per cent and a coherence time of 2 microseconds during ' hot' operation, comparable to those of spin qubits in natural silicon at millikelvin temperatures(13-16). Furthermore, we show that the unit cell can be operated at magnetic fields as low as 0.1 tesla, corresponding to a qubit control frequency of 3.5 gigahertz, where the qubit energy is well below the thermal energy. The unit cell constitutes the core building block of a full-scale silicon quantum computer and satisfies layout constraints required by error-correction architectures(8),(17). Our work indicates that a spin-based quantum computer could be operated at increased temperatures in a simple pumped He-4 system (which provides cooling power orders of magnitude higher than that of dilution refrigerators), thus potentially enabling the integration of classical control electronics with the qubit array(18,19).
领域	地球科学 ; 气候变化 ; 资源环境
收录类别	SCI-E
WOS记录号	WOS:000530151300025
WOS关键词	ELECTRON-SPIN ; GATE ; DOT ; QUBIT ; COHERENCE ; FIDELITY ; NOISE
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/281525
专题	地球科学资源环境科学气候变化
作者单位	1.Stanford Univ, Dept Genet, Sch Med, Stanford, CA 94305 USA; 2.Stanford Univ, Program Canc Biol, Sch Med, Stanford, CA 94305 USA; 3.Stanford Univ, Dept Med, Sch Med, Stanford, CA 94305 USA; 4.Stanford Univ, Stanford Canc Inst, Sch Med, Stanford, CA 94305 USA; 5.Stanford Univ, Dept Comp Sci, Stanford, CA 94305 USA; 6.Univ Calif San Francisco, Dept Pediat, San Francisco, CA USA; 7.Stanford Univ, Dept Microbiol & Immunol, Sch Med, Baxter Lab, Stanford, CA 94305 USA; 8.Stanford Univ, Sch Med, Dept Med & Biomed Data Sci, Stanford, CA 94305 USA; 9.Stanford Univ, Dept Pathol, Sch Med, Stanford, CA 94305 USA; 10.Stanford Univ, Program Chem Engn & Med Human Hlth ChEM H, Stanford, CA 94305 USA
推荐引用方式 GB/T 7714	Han, Kyuho,Pierce, Sarah E.,Li, Amy,et al. Operation of a silicon quantum processor unit cell above one kelvin[J]. NATURE,2020,580(7803):350-+.
APA	Han, Kyuho.,Pierce, Sarah E..,Li, Amy.,Spees, Kaitlyn.,Anderson, Grace R..,...&Yao, David.(2020).Operation of a silicon quantum processor unit cell above one kelvin.NATURE,580(7803),350-+.
MLA	Han, Kyuho,et al."Operation of a silicon quantum processor unit cell above one kelvin".NATURE 580.7803(2020):350-+.