Scientists have created the world's first nanophotonic electron accelerator, which speeds negatively charged particles with mini laser pulses and is small enough to fit on a coin.
I've got an unconventional application idea for this particle accelerator on a chip.
True random number generation. There's loads of random information that can be measured from such a device in a controlled manner.
If you could fit one of these on a motherboard then you wouldn't even need to call a pseudo random number generator algorithm anymore, you can pull data directly from the chip.