John Stewart Bell Quotes

• I am a Quantum Engineer, but on Sundays I Have Principles.

  John Stewart Bell

  Sunday, Principles, Quantum

  Opening sentence of his "underground colloquium" in March 1983, as quoted by Nicolas Gisin in "Quantum [un]speakables: from Bell to quantum information", p. 199, 2002.

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• No theory of reality compatible with quantum theory can require spatially separate events to be independent.

  John Stewart Bell

  Independent, Reality, Events

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• Long may Louis de Broglie continue to inspire those who suspect that what is proved by impossibility proofs is lack of imagination.

  John Stewart Bell

  Inspiration, Long, Imagination

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• El concepto de "medida" se vuelve tan difuso al reflexionar sobre él que resulta bastante sorprendente que aparezca en la teoría física al nivel más fundamental... ¿no requiere cualquier análisis de la medida conceptos más fundamentales que la medida? ¿Y no debería la teoría fundamental tratar de estos conceptos más fundamentales?

  John Stewart Bell

  Reflection, Doe, Analysis

  "Quantum Gravity". Book by Dennis William Sciama, p. 611. "Quantum Mechanics for Cosmologists", 1981.

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• Theoretical physicists live in a classical world, looking out into a quantum-mechanical world. The latter we describe only subjectively, in terms of procedures and results in our classical domain.

  John Stewart Bell

  World, Quantum, Results

  "Speakable and Unspeakable in Quantum Mechanics". Book by John Stewart Bell, p. 29, 1987.

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• It is difficult for me to believe that quantum mechanics, working very well for currently practical set-ups, will nevertheless fail badly with improvements in counter efficiency.

  John Stewart Bell

  Believe, Improvement, Failing

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