World's fastest quantum transistor works at PHz-speed in ambient conditions; a graphene phototransistor modified introducing a silicon layer

https://www.eurekalert.org/news-releases/1084455

"quantum tunneling in graphene using light pulses lasting <1 trillionth of second, switching off/ on at 638 as rate, where electrons bypass physical barrier almost instantaneously forming into current... tunneling overcomes currents mirroring/ canceling each other out... ultrafast computers... future: incorporating the PHz-speed transistor into a microchip"

Related: Thermal quenching, controlled heating and cooling, switches quantum material between a metal conductive state and an insulating state
https://news.northeastern.edu/2025/06/27/quantum-electronics-speed-discovery/