Coherence of a field gradient driven singlet-triplet qubit coupled to multielectron spin states in 28Si/SiGe

IF 6.6 1区 物理与天体物理 Q1 PHYSICS, APPLIED npj Quantum Information Pub Date : 2024-08-14 DOI:10.1038/s41534-024-00869-y
Younguk Song, Jonginn Yun, Jehyun Kim, Wonjin Jang, Hyeongyu Jang, Jaemin Park, Min-Kyun Cho, Hanseo Sohn, Noritaka Usami, Satoru Miyamoto, Kohei M. Itoh, Dohun Kim
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Abstract

Engineered spin-electric coupling enables spin qubits in semiconductor nanostructures to be manipulated efficiently and addressed individually. While synthetic spin-orbit coupling using a micromagnet is widely investigated for driving and entangling qubits based on single spins in silicon, the baseband control of encoded spin qubits with a micromagnet in isotopically purified silicon has been less well investigated. Here, we demonstrate fast singlet-triplet qubit oscillation (~100 MHz) in a gate-defined double quantum dot in 28Si/SiGe with an on-chip micromagnet with which we show the oscillation quality factor of an encoded spin qubit exceeding 580. The coherence time T2* is analyzed as a function of potential detuning and an external magnetic field. In weak magnetic fields, the coherence is limited by frequency-independent noise whose time scale is faster than the typical data acquisition time of ~100 ms, which limits the T2* below 1 μs in the ergodic limit. We present evidence of sizable and coherent coupling of the qubit with the spin states of a nearby quantum dot, demonstrating that appropriate spin-electric coupling may enable a charge-based two-qubit gate in a (1,1) charge configuration.

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28Si/SiGe 中与多电子自旋态耦合的场梯度驱动单三重四比特的相干性
经过设计的自旋-电耦合使半导体纳米结构中的自旋量子比特能够被有效操纵和单独处理。虽然利用微磁体合成自旋轨道耦合用于驱动和纠缠硅中基于单个自旋的量子比特已得到广泛研究,但利用微磁体在同位素纯化硅中对编码自旋量子比特进行基带控制的研究却较少。在这里,我们展示了在 28Si/SiGe 栅极定义的双量子点中利用片上微磁实现的快速单三重量子比特振荡(约 100 MHz),我们发现编码自旋量子比特的振荡品质因数超过了 580。我们分析了相干时间 T2* 与电位失谐和外部磁场的函数关系。在弱磁场中,相干性受到与频率无关的噪声的限制,噪声的时间尺度比典型的数据采集时间(约 100 毫秒)更快,在遍历极限中将 T2* 限制在 1 μs 以下。我们提出了量子比特与附近量子点自旋态之间可观的相干耦合证据,证明适当的自旋-电耦合可以在(1,1)电荷配置中实现基于电荷的双量子比特门。
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来源期刊
npj Quantum Information
npj Quantum Information Computer Science-Computer Science (miscellaneous)
CiteScore
13.70
自引率
3.90%
发文量
130
审稿时长
29 weeks
期刊介绍: The scope of npj Quantum Information spans across all relevant disciplines, fields, approaches and levels and so considers outstanding work ranging from fundamental research to applications and technologies.
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