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Google claims to have achieved a major breakthrough with "quantum supremacy". But what could quantum computers actually do, and how soon will they be useful?Manuela Saragosa speaks to Harvard quantum computing researcher Prineha Narang, who says that the devices she is working on are annoyingly "noisy", but could still make an important contribution to tackling climate change in the next few years. There are fears that quantum computers could one day crack modern encryption techniques - rendering private communications and financial transactions unsafe. But IBM cryptography researcher Vadim Lyubashevsky says don't worry, they've got the problem in hand.Plus, the BBC's technology correspondent Rory Cellan-Jones delineates the greatest paradox of quantum computers - that nobody can explain how they work.Producer: Laurence Knight(Picture: Engineer working on IBM Q System One quantum computer; Credit: Misha Friedman/Getty Images)

One of the world's top thinkers on artificial intelligence, tells us why we should be cautious but not terrified at the prospect of computers that can outsmart us.Professor Stuart Russell of the University of California, Berkeley, tells Ed Butler where he thinks we are going wrong in setting objectives for existing artificial intelligence systems, and the risk of unintended consequences.Plus IBM fellow and computer engineer John Cohn talks about blockchain, deep neural networks and symbolic reasoning.(Picture: Ponderous robot; Credit: PhonlamaiPhoto/Getty Images)

Liesel Pritzker Simmons and her husband Ian Simmons are billionaires who come from successful US business families. Liesel's family is best known for founding Hyatt hotels. Both say the the US government should be collecting more tax from super-rich people like them. We asked them why. And Dr Ted Klontz, associate professor of practice and financial psychology at Creighton University in the US, explains the psychology of a billionaire.(Photo: A gold Ferrari parked outside an expensive boutique in London, Credit: Getty Images)