2025/06/20 by Gérard, Domitille, Buil, Stéphanie, Watanabe, Kenji +3 · 3 citations
Engineering · Materials Science · Physics and Astronomy · #Advanced Fiber Laser Technologies #Diamond and Carbon-based Materials Research #FOS: Physical sciences #Nonlinear Optical Materials Studies #Optics (physics.optics)
paper · pdf · doi:10.48550/arxiv.2506.16980
openalex publication_date 2025/06/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Optically active defects in hexagonal boron nitride (hBN) have become amongst the most attractive single-photon emitters in the solid state, owing to their high-quality photophysical properties, combined with the unlimited possibilities of integration offered by the host two-dimensional material. In particular, the B centres, with their narrow linewidth, low wavelength spread and controllable positioning, have raised a particular interest for integrated quantum photonics. However, to date, either their excitation or their detection has been performed non-resonantly due to the difficulty of rejecting the backreflected laser light at the same wavelength, thereby preventing to take full benefit from their high coherence in quantum protocols. Here, we make use of a narrow-linewidth emitter integrated in a hybrid metal-dielectric structure to implement crossed-polarisation laser rejection. This allows us to observe resonantly scattered photons, with associated experimental signatures of optical coherence in both continuous-wave (cw) and pulsed regimes, respectively the Mollow triplet and Hong-Ou-Mandel interference from zero-phonon-line emission. The measured two-photon interference visibility of 0.93 +/- 0.21 and 0.92 +/- 0.26 we measured for two emitters demonstrate the potential of B centres in hBN for applications to integrated quantum information.