期刊
PHYSICAL REVIEW LETTERS
卷 119, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.119.227206
关键词
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资金
- Office of Naval Research
- Natural Sciences and Engineering Research Council of Canada
- Swiss National Science Foundation [PZ00P2_167965]
- Consejo Nacional de Investigaciones Cientificas y Tecnicas [PIP11220150100327]
- Fondo para la Investigacion Cientifica y Tecnologica [PICT-2012-2866]
- Marie Curie-Initial Training Networks (ITN) program [607904-SPINOGRAPH]
- Fundacao para a Ciencia e a Tecnologia (FCT) [PTDC/FIS-NAN/4662/2014]
- [IBS-R027-D1]
- Fundação para a Ciência e a Tecnologia [PTDC/FIS-NAN/4662/2014] Funding Source: FCT
- Swiss National Science Foundation (SNF) [PZ00P2_167965] Funding Source: Swiss National Science Foundation (SNF)
Quantum spin networks having engineered geometries and interactions are eagerly pursued for quantum simulation and access to emergent quantum phenomena such as spin liquids. Spin-1/2 centers are particularly desirable, because they readily manifest coherent quantum fluctuations. Here we introduce a controllable spin-1/2 architecture consisting of titanium atoms on a magnesium oxide surface. We tailor the spin interactions by atomic-precision positioning using a scanning tunneling microscope (STM) and subsequently perform electron spin resonance on individual atoms to drive transitions into and out of quantum eigenstates of the coupled-spin system. Interactions between the atoms are mapped over a range of distances extending from highly anisotropic dipole coupling to strong exchange coupling. The local magnetic field of the magnetic STM tip serves to precisely tune the superposition states of a pair of spins. The precise control of the spin-spin interactions and ability to probe the states of the coupled-spin network by addressing individual spins will enable the exploration of quantum many-body systems based on networks of spin-1/2 atoms on surfaces.
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