Wang Yu, Chen Chin-Yi, Klimeck Gerhard, Simmons Michelle Y, Rahman Rajib
Network for Computational Nanotechnology, Purdue University, West Lafayette, IN 47907, USA.
Centre for Quantum Computation and Communication Technology, School of Physics, University of New South Wales, Sydney, NSW 2052, Australia.
Sci Rep. 2016 Aug 23;6:31830. doi: 10.1038/srep31830.
Quantum dots patterned by atomically precise placement of phosphorus donors in single crystal silicon have long spin lifetimes, advantages in addressability, large exchange tunability, and are readily available few-electron systems. To be utilized as quantum bits, it is important to non-invasively characterise these donor quantum dots post fabrication and extract the number of bound electron and nuclear spins as well as their locations. Here, we propose a metrology technique based on electron spin resonance (ESR) measurements with the on-chip circuitry already needed for qubit manipulation to obtain atomic scale information about donor quantum dots and their spin configurations. Using atomistic tight-binding technique and Hartree self-consistent field approximation, we show that the ESR transition frequencies are directly related to the number of donors, electrons, and their locations through the electron-nuclear hyperfine interaction.
通过在单晶硅中精确地原子级放置磷施主而形成的量子点具有长自旋寿命、可寻址性优势、大交换可调性，并且是易于获得的少电子系统。要将这些施主量子点用作量子比特，在制造后对其进行非侵入性表征并提取束缚电子和核自旋的数量及其位置非常重要。在这里，我们提出一种基于电子自旋共振（ESR）测量的计量技术，利用量子比特操纵所需的片上电路来获取有关施主量子点及其自旋配置的原子尺度信息。使用原子紧束缚技术和哈特里自洽场近似，我们表明ESR跃迁频率通过电子-核超精细相互作用与施主、电子的数量及其位置直接相关。
