Colloidal quantum dots (QDs) are nanoscale semiconductor crystals with surface ligands
that enable their dispersion in solvents. Quantum confinement effects facilitate wave function …

Rare-earth dopants are arguably one of the most studied optical centers in solids, with
applications spanning from laser optoelectronics, biosensing, lighting to displays …

Single-photon emitters play an important role in many leading quantum technologies. There
is still no'ideal'on-demand single-photon emitter, but a plethora of promising material …

We demonstrate optical probing of spectrally resolved single Nd 3+ rare-earth ions in yttrium
orthovanadate. The ions are coupled to a photonic crystal resonator and show strong …

Long coherence times are key to the performance of quantum bits (qubits). Here, we
experimentally and theoretically show that the Hahn-echo coherence time of electron spins …

Optically active point defects in wide-bandgap crystals are leading building blocks for
quantum information technologies including quantum processors, repeaters, simulators, and …

Quantum emitters such as the diamond nitrogen-vacancy (NV) center are the basis for a
wide range of quantum technologies. However, refraction and reflections at material …

Phase relations between quantum states represent a resource for storing and processing
quantum information. Although quantum phases are commonly controlled dynamically by …

Spin defects in semiconducting solids are promising platforms for the realization of quantum
bits. At low temperature and in the presence of a large magnetic field, the central spin …

We study the feasibility of meaningful proof-of-principle demonstrations of several quantum
repeater protocols with photon (single-photon and photon-pair) sources and atomic …