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Bell's Theorem: An Overlooked Quantum Milestone

2025-03-10

In 1964, John Stewart Bell published a largely unnoticed paper demonstrating that quantum mechanics is incompatible with locality, even if 'hidden variables' unaccounted for in quantum theory exist. This challenged the Copenhagen interpretation, sparking profound philosophical debates about the nature of reality. Bell's theorem was eventually experimentally verified, establishing a new foundation for quantum mechanics and prompting a reevaluation of the quantum world by philosophers. While Bell himself didn't receive widespread recognition during his lifetime, his contribution to the development of quantum mechanics is undeniable, with his work now forming the cornerstone of quantum information science.

Scalable Quantum Computing Takes a Leap Forward with Integrated Photonics

2025-03-01

Researchers at ETH Zurich have made a breakthrough in building scalable quantum computers. They overcame a major hurdle in trapped-ion quantum computing: instability in ion transport caused by the interaction between optical components and the ion trap. Using ingenious compensation methods, they achieved over 99% fidelity for single-qubit logic gates, paving the way for larger, more powerful quantum computers. This research represents a significant step towards practical quantum computing.