期刊
NANO LETTERS
卷 21, 期 3, 页码 1517-1522出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c04771
关键词
silicon; qubit; exchange interaction; superexchange
类别
资金
- U.S. Army Research Office [W911NF-17-1-0198]
- Australian Research Council [FL190100167, CE170100012]
- NSW Node of the Australian National Fabrication Facility
- MEXT
- NanoQuine
- FIRST
- JSPS Core-to-Core Program
- National Science Foundation [OCI-0725070, ACI-1238993]
- state of Illinois
Quantum gates between spin qubits can be implemented through controlled Heisenberg exchange interaction by adjusting the overlap between electronic wave functions. Another approach is to establish coupling between distant spins through mediated superexchange. Experimental evidence in a linear array of three single-electron spin qubits in silicon confirms direct exchange coupling and second neighbor mediated superexchange.
Quantum gates between spin qubits can be implemented leveraging the natural Heisenberg exchange interaction between two electrons in contact with each other. This interaction is controllable by electrically tailoring the overlap between electronic wave functions in quantum dot systems, as long as they occupy neighboring dots. An alternative route is the exploration of superexchange-the coupling between remote spins mediated by a third idle electron that bridges the distance between quantum dots. We experimentally demonstrate direct exchange coupling and provide evidence for second neighbor mediated superexchange in a linear array of three single-electron spin qubits in silicon, inferred from the electron spin resonance frequency spectra. We confirm theoretically, through atomistic modeling, that the device geometry only allows for sizable direct exchange coupling for neighboring dots, while next-nearest neighbor coupling cannot stem from the vanishingly small tail of the electronic wave function of the remote dots, and is only possible if mediated.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据