Over the past few decades, significant progress has been made in quantum information
technology, from theoretical studies to experimental demonstrations. Revolutionary quantum …

Owing to the inevitable loss in communication channels, the distance of entanglement
distribution is limited to approximately 100 kilometres on the ground. Quantum repeaters can …

Erbium ions embedded in crystals have unique properties for quantum information
processing, because of their optical transition at 1.5 μm and of the large magnetic moment of …

Counting the microwave photons emitted by an ensemble of electron spins when they relax
radiatively has recently been proposed as a sensitive method for electron paramagnetic …

Entanglement distillation is an essential ingredient for long-distance quantum
communication. However, owing to their demanding requirements, integrating such …

Erbium-doped solids are prime candidates for quantum memories in optical quantum
networks given their telecom-compatible photon emission. An electron spin of erbium with …

Spins in solids are an ideal candidate to act as a memory and interface with
superconducting qubits due to their long coherence times. We spectroscopically investigate …

Erbium doped crystals offer a versatile platform for hybrid quantum devices because they
combine magnetically sensitive electron-spin transitions with telecom-wavelength optical …

We report on infrared to visible Zeeman absorption spectroscopy and parameterised crystal-
field modelling of Nd 3+ centres in Y 2 SiO 5 through the use of experimentally inferred …

Rare-earth doped crystals have long coherence times and the potential to provide quantum
interfaces between microwave and optical photons. Such applications benefit from a high …