Seth Lloyd starts this episode by talking to Jim about the fundamentals of quantum physics: the quantum vs classical world, quantum interpretations, causality & randomness, the many-worlds theory, entanglement, and coherence. They then go on to talk about the emerging field of quantum computing: its incredible power & potential impacts on encryption, simulation vs other computation types, impacts on linear algebraic problems & machine learning, computational substrates, superconduction & topological systems, seeing the universe as a quantum computer & why it's so complex, quantum gravity, and much more.