Niels Bohr — "The great lesson of quantum theory is that there is no deep reality."
The great lesson of quantum theory is that there is no deep reality.
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More from Niels Bohr
"When it comes to atoms, language can be used only as poetry."
"We are all agreed that the only way to escape from the paradoxes of quantum theory is to give up the idea of a 'classical' description of reality."
"Truth and clarity are complementary."
"When it comes to atoms, language can be used only as in poetry. The poet, too, is not nearly so concerned with describing facts as with creating images and establishing mental connections."
"We are trapped by language to such a degree that every attempt to make progress in our understanding of the universe must also be an attempt to perfect our language."
Details
Attributed, reflects his philosophical stance on the interpretation of quantum mechanics.
Date: c. 1950s
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Understanding this quote
What it means
Reality at the smallest scales is not made of solid, definite things waiting to be found. Particles do not have fixed properties like position or speed until they are measured. What we call reality is shaped by the act of observation and the questions we ask. There is no hidden, objective layer underneath that exists independently of how we interact with it.
Relevance to Niels Bohr
Bohr built the planetary atomic model and then helped overturn classical physics by championing quantum mechanics. His Copenhagen interpretation insisted that quantum systems have no definite state before measurement, putting him at odds with Einstein's belief in an objective reality. He spent decades defending complementarity, the idea that contradictory descriptions like wave and particle are both needed, reflecting his conviction that observation defines outcomes.
The era
Bohr worked through the early twentieth century when physics was being rebuilt from the ground up. Experiments on atoms, electrons, and light defied Newtonian intuition, and scientists at Copenhagen, Gottingen, and Berlin debated what nature truly was. World wars displaced physicists, the atomic bomb loomed, and philosophy and science blurred. His statements challenged a culture that still expected science to deliver a fixed, knowable universe.
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