Quantum cheques could be a forgery-free way to move money

A quantum upgrade could make old-fashioned cheques the most secure way to send money. Researchers have proven that quantum computers could in theory create and cash cheques that are nearly impossible to forge. Quantum computers store information using qubits which, unlike the ones and zeros of classical computing, can exist in two states simultaneously. This is known as quantum superposition. But it's impossible to observe a qubit while it's in a superposition – it collapses into either a one or zero as soon as you measure it.