Laser Instantly turns material opaque to transparent, or conductor to insulator, may enable fastest processors possible

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https://www.eurekalert.org/news-releases/1076812

"speeds <1 light-wave cycle... powerful laser modifies matter's refractive properties, changing on extremely short timescale extent to which light passing through slows down... powerful long pulse laser modifies optical delay in material, extremely short attosecond pulse laser slow-motion video camera... attosecond pulses: 1 is reference not interacting with material, other passes through recording attosecond delays induced, interference between them enables delay reconstruction... ultrafast communication"