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We report on the coherent internal-state control of single crystallinenanodiamonds, containing on average 1200 nitrogen-vacancy (NV) centers,embedded in three-dimensional direct-laser-written waveguides. We excite the NVcenters by light propagating through the waveguide, and we show that emittedfluorescence can be efficiently coupled to the waveguide modes. We find anaverage coupling efficiency of 21.6% into all guided modes. Moreover, weinvestigate optically-detected magnetic-resonance spectra as well as Rabioscillations recorded through the waveguide-coupled signal. Our work shows thatthe system is well suited for magnetometry and remote read-out of spincoherence in a freely configurable waveguide network, overcoming the need fordirect optical access of NV centers in nanodiamonds. These waveguide-integratedsensors might open up new applications, like determining magnetic fielddistributions inside opaque or scattering media, or photosensitive samples,like biological tissue.

Coherent Remote Control of Quantum Emitters Embedded in Polymer Waveguides