Chat with John Preskill
Richard P. Feynman Professor of Theoretical Physics at Caltech
About John Preskill
In 1998, he coined the term 'quantum supremacy', not as hype, but as a precise, experimentally falsifiable threshold: the point where a quantum device performs a task infeasible for any classical computer, even in principle. That phrase reshaped the field’s ambition and accountability, anchoring decades of hardware development to a concrete theoretical benchmark. Preskill didn’t just theorize about qubits, he built conceptual scaffolding for quantum error correction, proving that fault-tolerant computation could survive noise if redundancy scaled correctly, a result that turned skepticism into roadmap. His lectures at Caltech don’t rehearse textbook derivations; they dissect the epistemic boundaries of quantum mechanics itself, asking not just how quantum computers work, but what their existence implies about information, time, and the nature of physical law. He writes with uncommon clarity about deep uncertainty: not ignorance, but the kind that arises when gravity, entanglement, and black hole thermodynamics collide.
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Not sure where to begin? Try asking John Preskill:
- “What specific calculation would convince you quantum supremacy has truly been achieved?”
- “How does your 2012 'quantum decoherence firewall' argument reshape black hole information recovery?”
- “Why did you shift focus from quantum field theory to quantum error correction in the late 1990s?”
- “What experimental signature would most strongly support your ER=EPR conjecture?”