A machine made of a 5 kilometre-long coil of fibre optic cable squeezed into a box a few metres across could give quantum computers a run for their money on certain tasks
Source:
https://www.newscientist.com/article/2228051-a-massive-optical-computer-being-built-could-outpace-quantum-computers/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home