Free coherent evolution of a coupled atomic spin system initialized by electron scattering

doi:10.1126/science.abg8223

GSTDTAP > 气候变化

DOI	10.1126/science.abg8223
	Free coherent evolution of a coupled atomic spin system initialized by electron scattering
	Lukas M. Veldman; Laëtitia Farinacci; Rasa Rejali; Rik Broekhoven; Jérémie Gobeil; David Coffey; Markus Ternes; Alexander F. Otte
	2021-05-28
发表期刊	Science
出版年	2021
英文摘要	The integration of pump-probe spectroscopy with scanning tunneling microscopy (STM) tools has allowed studies of spin relaxation in atoms on the nanosecond time scale. However, following the free evolution of a pair of entangled spins requires faster initial excitation than can be delivered with microwave pulses. Veldman et al. sequentially combined electron spin resonance–STM and direct-current pump-probe techniques to instantaneously flip spins while preserving spin coherence. They used this method to follow free, coherent flip-flop evolution of two coupled spin-1/2 atoms (hydrogenated titanium atom dimers) on a magnesium oxide surface. Science , abg8223, this issue p. [964][1] Full insight into the dynamics of a coupled quantum system depends on the ability to follow the effect of a local excitation in real-time. Here, we trace the free coherent evolution of a pair of coupled atomic spins by means of scanning tunneling microscopy. Rather than using microwave pulses, we use a direct-current pump-probe scheme to detect the local magnetization after a current-induced excitation performed on one of the spins. By making use of magnetic interaction with the probe tip, we are able to tune the relative precession of the spins. We show that only if their Larmor frequencies match, the two spins can entangle, causing angular momentum to be swapped back and forth. These results provide insight into the locality of electron spin scattering and set the stage for controlled migration of a quantum state through an extended spin lattice. [1]: /lookup/doi/10.1126/science.abg8223
领域	气候变化 ; 资源环境
URL	查看原文
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/328867
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Lukas M. Veldman,Laëtitia Farinacci,Rasa Rejali,et al. Free coherent evolution of a coupled atomic spin system initialized by electron scattering[J]. Science,2021.
APA	Lukas M. Veldman.,Laëtitia Farinacci.,Rasa Rejali.,Rik Broekhoven.,Jérémie Gobeil.,...&Alexander F. Otte.(2021).Free coherent evolution of a coupled atomic spin system initialized by electron scattering.Science.
MLA	Lukas M. Veldman,et al."Free coherent evolution of a coupled atomic spin system initialized by electron scattering".Science (2021).