Worldwide, enormous efforts are directed toward the development of the so‐called quantum
internet. Turning this long‐sought‐after dream into reality is a great challenge that will …

The nitrogen-vacancy (NV) colour centre in diamond is an important physical system for
emergent quantum technologies, including quantum metrology, information processing and …

For over 50 years, pure or doped silica glass optical fibres have been an unrivalled platform
for the transmission of laser light and optical data at wavelengths from the visible to the near …

Quantum key distribution—exchanging a random secret key relying on a quantum
mechanical resource—is the core feature of secure quantum networks. Entanglement-based …

We review the current status of single-photon-source and single-photon-detector
technologies operating at wavelengths from the ultraviolet to the infrared. We discuss …

The negatively charged nitrogen-vacancy (NV−) center in diamond has realized new
frontiers in quantum technology. Here, the optical and spin resonances of the NV− center …

Quantum key distribution (QKD) is the first quantum information task to reach the level of
mature technology, already fit for commercialization. It aims at the creation of a secret key …

The exploitation of emerging quantum technologies requires efficient fabrication of key
building blocks. Sources of single photons are extremely important across many …

Optically active point defects in crystals have gained widespread attention as photonic
systems that could be applied in quantum information technologies,. However, challenges …

The nitrogen vacancy and some nickel related defects in diamond can be observed as
single quantum systems in diamond by their fluorescence. The fabrication of single colour …