High-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?
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Electrically pumped GeSn lasers
Germanium–tin lasers can work at room temperature when another laser powers them. Can an electric current do the job?
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.
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?