The phenomenon is called superposition and is one of the key ingredients that enable a quantum computer to perform simultaneous calculations, with enormous computing potential as a result.

Researchers at Canadian firm Xanadu claim to have developed a quantum computer capable of doing a computation in a fraction of a second that would take a traditional computer 9,000 years to finish.

Quantum computing firm D-Wave says its devices can solve problems that would be virtually impossible for classical computers ...

Two independent teams of researchers have now devised methods for disrupting calculations on quantum computers. They both rely a method used to hack traditional computers called a row-hammer attack.