Just as “classical” information technology rests on a foundation built of interconnected
information-processing systems, quantum information technology (QIT) must do the same. A …

Photons at microwave and optical frequencies are principal carriers for quantum information.
While microwave photons can be effectively controlled at the local circuit level, optical …

Integrated photonics will play a key role in quantum systems as they grow from few-qubit
prototypes to tens of thousands of qubits. The underlying optical quantum technologies can …

Entangling microwave-frequency superconducting quantum processors through optical light
at ambient temperature would enable means of secure communication and distributed …

Rare-earth ions (REIs) are promising solid-state systems for building light–matter interfaces
at the quantum level,. This relies on their potential to show narrow optical and spin …

Optical photons are powerful carriers of quantum information, which can be delivered in free
space by satellites or in fibers on the ground over long distances. Entanglement of quantum …

Distributing entanglement over long distances using optical networks is an intriguing
macroscopic quantum phenomenon with applications in quantum systems for advanced …

The coupling of microwave and optical systems presents an immense challenge due to the
natural incompatibility of energies, but potential applications range from optical …

Rare‐earth (RE) ion doped crystalline materials have a wide spectrum of applications in
lasers, amplifiers, sensors, as well as classical and quantum information processing. The …

Rare earth emitters enable critical quantum resources including spin qubits, single photon
sources, and quantum memories. Yet, probing of single ions remains challenging due to low …