Water-based circuit concept switches much faster than semiconductors.

Short laser pulse is fired into the water jet with iodide ions dissolved into it bumps electrons out of the dissolved salts, essentially boosting the conductivity of the water.

A second laser can read back what state the water is in, providing the “on” and “off” options of an existing transistor.

Because the laser pulse is so fast, the water can switch states in a matter of picoseconds.

newatlas.com/electronics/water