Science Magazine Podcast Grappling with declining populations, and the future of quantum mechanics
Dec 4, 2025
Join Zack Savitsky, a contributing news correspondent for Science and a voice on quantum mechanics, as he explores the philosophical depths of quantum measurement problems. He dives into interpretations and thought experiments like Wigner's Friend, examining conflicting realities. Then, hear from Anne Goujon, a program director at the International Institute for Applied Systems Analysis, as she discusses global population trends. She highlights uncertainties post-peak population and advocates for adapting policies to support low-fertility societies and aging populations.
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Copenhagen Leaves Measurement Unspecified
- The Copenhagen interpretation accepts the measurement postulate but leaves 'measurement' undefined.
- That lack of mechanism frustrates physicists who want a deeper explanation.
Wigner's Friend Paradox
- Eugene Wigner's thought experiment imagines a sealed lab where a friend measures a quantum coin while Wigner stays outside.
- The friend sees a definite outcome while Wigner treats the whole lab as a superposition, creating a paradox.
Quantum States As Relative Information
- Relational and QBism (cubism) treat quantum states as information relative to observers or agents.
- They loosen objective reality by allowing different observers to hold different valid descriptions.