Fig. 1: A nanophotonic quantum device hosting an electronuclear spin register.
a, Microscopy photograph of the packaged device. An ultraviolet-cured optical adhesive permanently fixes the tapered fibre after it is contacted onto a diamond microchiplet. b, Experimental setup. We excite the emitter near resonance and collect both PSB fluorescence and resonant reflection (ZPL) light into the single-photon detectors (SPDs). c, Electronic structure of the SnV centre. The hyperfine coupling between the electron (e) and 117Sn nucleus (n) results in a splitting of the optical transition at zero magnetic field. A non-zero magnetic field further splits the two electronic states. d, Photoluminescence (PL) under 130 nW of 532 nm off-resonant excitation. An inhomogeneous-distribution full-width at half-maximum of 90(2) GHz is extracted from Gaussian fits (solid line). e, Photoluminescence under resonant excitation (PLE) at B = 0. A homogeneous-linewidth full-width at half-maximum of 70(5) MHz is extracted from Lorentzian fits (solid line). The inset shows the second-order resonant autocorrelation function with a Bloch-equation-based fit31 (solid line).
