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. 2018 May 30;8:8430. doi: 10.1038/s41598-018-26633-9

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Setup schematic: a 532 nm Laser, pulsed with an acousto-optic modulator (AOM), is used to excite the NV center via a high numerical aperture (NA = 1.40) objective. The nanodiamond is positioned by means of AFM assisted pick-and-place on a glass support photolithographically patterned with a gold impedance matched coplanar waveguide (CPW, depicted as a yellow rectangle on the grey cover slide) where a diluted suspension of iron oxide superparamagnetic nanoparticles was precedently spin-coated. The coplanar waveguide generates the radio frequencies used to drive the NV center spin transitions. Two pairs of Helmholtz coils provide a static magnetic field up to 40 G per axis along the coordinates defined as x’y’ and parallel to the support, while the CPW delivers an AC magnetic field aligned with z’ and orthogonal to the support. The NV center defines the coordinate system xyz as depicted in a). The fluorescence is collected by the high NA objective and sent to an Hanbury-Brown-Twiss section where two single photon Avalanche Photodiodes (APDs) perform the intensity correlation measurement. The AFM can be used to manipulate a single iron oxide nanoparticles (SPION - depicted as a blue circle) and couple it in a controlled way to the NV center in the nanodiamond.