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Single defect centers in layered hexagonal boron nitride (hBN) are promisingcandidates as single photon sources for quantum optics and nanophotonicsapplications. However, until today spectral instability hinders manyapplications. Here, we perform resonant excitation measurements and observeFourier-Transform limited (FL) linewidths down to $\approx 50$ MHz. Weinvestigate optical properties of more than 600 quantum emitters (QE) in hBN.The QEs exhibit narrow zero-phonon lines (ZPL) distributed over a spectralrange from 580 nm to 800 nm and with dipole-like emission with highpolarization contrast. The emission frequencies can be divided into four mainregions indicating distinct families or crystallographic structures of the QEs,in accord with ab-initio calculations. Finally, the emitters withstand transferto a foreign photonic platform - namely a silver mirror, which makes themcompatible with photonic devices such as optical resonators and paves the wayto quantum photonics applications including quantum commmunications and quantumrepeaters.

Narrowband quantum emitters over large spectral range with Fourier-limited linewidth in hexagonal boron nitride