Topic: Quantum foundations

Theoretical physicist Jonathan Halliwell joins Steven Strogatz and Janna Levin to discuss how quantum decoherence helps explain the transition from wave-like quantum systems to the classical macroscopic world. The conversation covers quantum cosmology, decoherent histories, the measurement problem, macroscopic realism and why the quantum-to-classical transition does not require a conscious observer.

Kenneth Wharton of San Jose State University discusses local weak values in quantum circuits and whether they support a covariant description of individual qubits. The talk considers entanglement, constraints across an entire circuit and the relationship between quantum systems and classical spacetime. The confirmed Quantum Foundations seminar takes place on 10 September 2026, from 11:00 to 12:30 Toronto time in Perimeter Institute's Bob Room.

Sean Carroll examines quantum mechanics on its own terms and asks how the familiar everyday world emerges from its formalism. The episode explores the tension between quantum theory and classical intuition, including how competing interpretations approach measurement and physical reality.