Theorem of Quantum Information Theory

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There's a long standing worry about quantising gravity. People don't understand the full theory of quantum gravity. So some people have said, well, maybe it's because gravity still is classical, while everything else is quantum. And one of the problems woth testing that proposal experimentally is that nobody knows what it means. But you've actually proposed a set up in which it could be done. You can still test the idea based on these general principles. In principle, even if in practice it's very hard, you'veactually proposed a set-up in which itcould be done. Yes, exactly. E, that there is such er scepticism about the fact that i the laws

Traditional physics works within the “Laplacian paradigm”: you give me the state of the universe (or some closed system), some equations of motion, then I use those equations to evolve the system through time. Constructor theory proposes an alternative paradigm: to think of physical systems in terms of counterfactuals — the set of rules governing what can and cannot happen. Originally proposed by David Deutsch, constructor theory has been developed by today’s guest, Chiara Marletto, and others. It might shed new light on quantum gravity and fundamental physics, as well as having applications to higher-level processes of thermodynamics and biology.

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Chiara Marletto received her DPhil in physics from the University of Oxford. She is currently a research fellow at Wolfson College, University of Oxford. Her new book is The Science of Can and Can’t: A Physicist’s Journey Through the Land of Counterfactuals.

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