Electrically pumped GeSn lasers
Germanium–tin lasers can work at room temperature when another laser powers them. Can an electric current do the job?
Electronics and photonics
Lasers, clocks, analog circuits and devices for moving quantum information through optical networks.
Subjects: Electronic devices · Communication systems · Quantum computing
Problems in this collection
7 problemsHigh-precision analog in-memory computing
Several methods correct errors in analog memory calculations. How should they be combined when inputs, noise and conversion costs change?
Microwave–optical quantum transduction
Can a practical interface transfer quantum information between microwave circuits and optical links with little loss or added noise?
All-photonic quantum repeaters
Can photonic repeaters distribute useful entanglement over many links without long-lived matter memories?
Room-temperature perovskite laser diodes
Perovskite crystals can lase continuously at room temperature when lit by another light source. A directly powered laser diode has now worked at 8 kelvin; bringing that operation to room temperature remains the target.
Atomic X-ray laser oscillators
An X-ray oscillator could repeatedly amplify light in excited atoms inside a crystal cavity. Atomic gain and fast copper-target delivery are demonstrated; assembling this into a coherent hard-X-ray oscillator remains a distinct device goal.
Solid-state nuclear clock accuracy
Laser-controlled clocks can already use thorium-229 nuclei inside crystals. Can their environmental shifts be measured and controlled well enough to establish a complete fractional-frequency uncertainty near 10^-18?