Coherent spin manipulation of individual atoms on a surface

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Science  25 Oct 2019:
Vol. 366, Issue 6464, pp. 509-512
DOI: 10.1126/science.aay6779

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Coherent surface spin manipulation

Spin-based quantum information processing requires coherent spin manipulation. Yang et al. demonstrate coherent control of surface titanium and iron atom spins on a magnesium oxide surface with a magnetic scanning tunneling microscope tip. Arbitrary sequences of fast electrical pulses delivered to the top induced large electric fields. These fields drove metal-atom movement, which then modulated the tip-atom exchange interaction to create an oscillating effective magnetic field. Advanced spin-control protocols such as Ramsey fringes and Hahn spin echoes revealed quantum dynamics, such as coherent oscillations in a titanium atom dimer assembled on the surface with the tip.

Science, this issue p. 509

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