This 'Harry Potter' light sensor achieves magically high efficiency of 200%

https://techxplore.com/news/2023-02-harry-potter-sensor-magically-high.html

"photodiode quantum efficiency counts number of photons the diode converts into electrons... Illuminating solar cells with green light enhances quantum efficiency... every infrared photon converted in an electron, gets company from a bonus electron... detect minute changes in amount of infrared light reflected back into diode an indication of changes in blood pressure in person's veins, indicating heart rate... pointed at the person's chest measures respiration rate from light movements in the thorax"

Related: Quantum sensors paving the way for new technologies

https://phys.org/news/2023-08-quantum-sensors-paving-technologies.html