Babbage from The Economist (subscriber edition) Unfinished business (part 1): quantum physics turns 100
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Dec 3, 2025 
Join theoretical physicist Paul Davies, renowned for his work in quantum gravity, as he delves into the fascinating world of quantum physics. He discusses its revolutionary impact on technology, from lasers to smartphones. Learn how quantum indeterminacy contrasts with classical determinism and the implications of Schrödinger's wave equation. Davies also explores the potential of a quantum internet and the synergies between quantum computing and AI, while pondering if a post-quantum theory might be on the horizon.
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Quantum Explains The Small And The Big
- Quantum mechanics governs atoms and subatomic particles and defies everyday intuition.
- It nevertheless explains stellar fusion, photosynthesis and powers modern tech like lasers and semiconductors.
Uncertainty Is Built Into Nature
- Quantum behaviour is dominated by inherent uncertainty and indeterminism, not measurement limits.
- Physicists calculate probabilities, like betting odds, rather than deterministic outcomes.
Planck's Quantum And Einstein's Photoelectric Fix
- Max Planck introduced 'quanta' to fix the hot-body radiation problem by proposing discrete energy packets.
- Einstein applied this to light explaining the photoelectric effect and winning a Nobel Prize for the idea.
