Abstract
Abstract Hybrid quantum photonics combines classical photonics with quantum emitters in a postprocessing step. It facilitates to link ideal quantum light sources to optimized photonic platforms. Optical cavities enable to harness the Purcell-effect boosting the device efficiency. Here, we postprocess a free-standing, crossed-waveguide photonic crystal cavity based on Si3N4 with SiV− center in nanodiamonds. We develop a routine that optimizes the overlap with the cavity electric field utilizing atomic force microscope (AFM) nanomanipulation to attain control of spatial and dipole alignment. Temperature tuning further gives access to the spectral emitter-cavity overlap. After a few optimization cycles, we resolve the fine-structure of individual SiV− centers and achieve a Purcell enhancement of more than 4 on individual optical transitions, meaning that four out of five spontaneously emitted photons are channeled into the photonic device. Our work opens up new avenues to construct efficient quantum photonic devices.
Highlights
Diamond is among the leading material platforms for spinbased photonic quantum technologies [1, 2]
The highly efficient coupling of individual atomic transitions to photonic circuits lays the foundation for quantum applications such as quantum networks [18] or on-chip Boson sampling [19–21] based on hybrid quantum photonics
While the pump waveguide is optimized for 532 nm, the probe waveguide is optimized for 740 nm, which matches the zero phonon line (ZPL) of the SiV− center
Summary
Diamond is among the leading material platforms for spinbased photonic quantum technologies [1, 2]. Hybrid attempts based on color centers in diamond and high-refractive index photonics devices have been demonstrated in the past years [9–12] with challenges arising from weak evanescent coupling, high-background fluorescence or Q-factor degradation [13]. Large coupling was achieved between an ensemble of NV− center in nanodiamonds (NDs) and the mode of a high-Q, free-standing photonic crystal cavity (PCC) in Si3N4 where, at the same time, the background fluorescence was suppressed by ∼ −20 dB in a crossed-waveguide pump-probe design [14]. In this work we post-process a high-Q PCC based on Si3N4 which was optimized for quantum photonics applications with SiV− centers in NDs. We take advantage of bulklike optical and coherence properties of SiV− center in NDs [15, 16], and high-precision nanomanipulation tools [4, 17] in order to access spatial and dipole degrees of freedom via atomic force microscope (AFM) nanomanipulation [16]. The highly efficient coupling of individual atomic transitions to photonic circuits lays the foundation for quantum applications such as quantum networks [18] or on-chip Boson sampling [19–21] based on hybrid quantum photonics
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