DFMs main competences are the development of measurement standards and methods with the aim of providing high level measurement services. DFM has many years of experience with quantum optical measurements, fibre optics, QKD calibrations, development of ultra-stable lasers, quantum materials growth and nano-scale characterization. DFM can provide traceable measurements, ultra-stable lasers, quantum reference materials, single-photon calibrator, quality assurance, uncertainty estimates and measurement procedures.