Quantum computers pose great risks but their potential could change the world

Quantum computers have been touted for their potential to revolutionize the world — and British company Oxford Ionics claims to be building the most powerful quantum computers out there. The company’s CEO and co-founder Dr Chris Ballance joined CNBC’s Tom Chitty and Arjun Kharpal at Web Summit, one of Europe's biggest tech events. In this episode, we explore what exactly quantum computing is, how it could transform certain industries, and the threat it poses to cyber security and our personal data.