  On demand single photon emitters (SPEs) play a key role across a broad range
of quantum technologies, including quantum computation, quantum simulation,
quantum metrology and quantum communications. In quantum networks and quantum
key distribution protocols, where photons are employed as flying qubits,
telecom wavelength operation is preferred due to the reduced fibre loss.
However, despite the tremendous efforts to develop various triggered SPE
platforms, a robust source of triggered SPEs operating at room temperature and
the telecom wavelength is still missing. Here we report a triggered, optically
stable, room temperature solid state SPE operating at telecom wavelengths. The
emitters exhibit high photon purity (~ 5% multiphoton events) and a record-high
brightness of ~ 1.5 MHz. The emission is attributed to localized defects in a
gallium nitride (GaN) crystal. The high performance SPEs embedded in a
technologically mature semiconductor are promising for on-chip quantum
simulators and practical quantum communication technologies.
