  Emitters of indistinguishable single photons are crucial for the growing
field of quantum technologies. To realize scalability and increase the
complexity of quantum optics technologies, multiple independent yet identical
single photon emitters are also required. However typical solid-state single
photon sources are inherently dissimilar, necessitating the use of electrical
feedback or optical cavities to improve spectral overlap between distinct
emitters. Here, we demonstrate bright silicon-vacancy (SiV-) centres in
low-strain bulk diamond which intrinsically show spectral overlap of up to 91%
and near transform-limited excitation linewidths. Our results have impact upon
the application of single photon sources for quantum optics and cryptography,
and the production of next generation fluorophores for bio-imaging.
