Strong mechanical driving of a single electron spin
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Barfuss, A., Teissier, J., Neu, E., Nunnenkamp, A., & Maletinsky, P. (2015). Strong mechanical driving of a single electron spin. Nature Physics, 11 820-824. https://doi.org/10.1038/nphys3411
Quantum devices for sensing and computing applications require coherent quantum systems, which can be manipulated in fast and robust ways . Such quantum control is typically achieved using external electromagnetic fields, which drive the system's orbital , charge  or spin [4, 5] degrees of freedom. However, most existing approaches require complex and unwieldy gate structures, and with few exceptions [6, 7] are limited to the regime of weak coherent driving. Here, we present a novel approach to coherently drive a single electronic spin using internal strain fields [8-10] in an integrated quantum device. Specifically, we employ time-varying strain in a diamond cantilever to induce long-lasting, coherent oscillations of an embedded Nitrogen-Vacancy (NV) centre spin. We perform direct spectroscopy of the phonon-dressed states emerging from this drive and observe hallmarks of the sought-after strong drivng regime [6, 11], where the spin rotation frequency exceeds the spin splitting. Additionally, we employ our continuous strain driving to significantly enhance the NV's spin coherence time . Our room-temperature experiments thereby constitute an important step towards strain-driven, integrated quantum devices and open new perspectives to investigate unexplored regimes of strongly driven multi-level systems  and to study exotic spin dynamics in hybrid spin-oscillator devices.
We gratefully acknowledge financial support from SNI; NCCR QSIT; SNF grants 200021_143697; and EU FP7 grant 611143 (DIADEMS). AN holds a University Research Fellowship from the Royal Society and acknowledges support from the Winton Programme for the Physics of Sustainability.
External DOI: https://doi.org/10.1038/nphys3411
This record's URL: https://www.repository.cam.ac.uk/handle/1810/248752