Add Yahoo as a preferred source to see more of our stories on Google. Quantum computers are coming. And when they arrive, they are going to upend the way we protect sensitive data. Unlike classical ...

Quantum computing is becoming real and will soon be able to solve problems well beyond the capabilities of today's fastest supercomputers. In the wrong hands, however, quantum computers will also ...

The original version of this story appeared in Quanta Magazine. Imagine a town with two widget merchants. Customers prefer cheaper widgets, so the merchants must compete to set the lowest price.