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# Through Two Doors at Once: The Elegant Experiment That Captures the Enigma of Our Quantum Reality

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**One of***Smithsonian***'s Favorite Books of 2018****One of***Forbes***'s 2018 Best Books About Astronomy, Physics and Mathematics****One of***Kirkus***'s Best Books of 2018****The intellectual adventure story of the "double-slit" experiment, showing how a sunbeam split into two paths first challenged our understanding of light and then the nature of reality itself--and continues to almost 200 year**...more

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Hardcover, 304 pages

Published
August 7th 2018
by Dutton Books

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(phtn = h * c): “Through Two Doors at Once - The Elegant Experiment That Captures the Enigma of Our Quantum Reality” by Anil Ananthaswam

“If it crossed your mind that human consciousness is somehow involved in causing the photon to behave one way or the other [particle vs. wave], you wouldn’t be alone in thinking so.”

In “Through Two Doors at Once - The Elegant Experiment That Captures the Enigma of Our Quantum Reality” by Anil Ananthasw ...more

The Double-Slit Experiment is one of the earliest physical experiments that demonstrates many of the mind-bending attributes o ...more

Strictly, the book should probably be called 'Through Tw ...more

"Richard Feynman said that the double-slit experiment seemed to have been ‘designed to contain all of the mystery of quantum mechanics.’

Are you facing a difficult decision? Quantum physics may have the answer, says science journalist Anil Ananthaswamy. Type your dilemma into the Universe Splitter app, tap a button, and a signal will be sent to a laboratory in Switzerland. A message will come back telling you which choice to make, along with the assurance t ...more

The second half is much more interesting as the author takes you a tour of the more recent, mind boggling tests of entanglement in quantum physics which seem to definitively prove Einstein wrong and imply the Universe is non local in someway. However, even though the results are fascinating, I fo ...more

"I will not describe it in terms of an analogy with something familiar. I’ll simply describe it."

When I read a book like this, I'm reminded how lacking science education can be at times. If the double slit experiment is covered in physics or chemistry classes, it's usually ...more

Quantum physics beyond the uncertainty realms and Copenhagen interpretation is complicated to make sense of. Both thought experiments and their real-life versions, many including the double slits, are hard to follow in implications and on their importance. Mr. Ananthaswamy wastes no time on concepts usu ...more

I enjoyed the history and progression of ideas. Each interpretation of the double slit experiment sounded perfect, but I knew something better was coming because the book wasn't finished.

Overall it's not very practical. This book won't make you a better person or help you out in life, but if you're curious about quantum physics or wildly interesting ideas/experiments. This book is perfect. ...more

The book does a great job of explaining the evolution, philosophy, and differing opinions through the lens (or slits) of a single (double?) experiment.

Thoroughly enjoyed it. Can't say that I understand the subject fully, specially the last two chapters on Everett's Many Worlds Interpretation and Penrose/GRW's quantum gravitation. Definitely ...more

Curiously enough, my physics professor has been a big fan of the Young's Double Slit experiment. An introduction to YDSE at high school gave a very wave like treatment to explain the interference patterns.

Now, arriving at this book - I would think that this was the best way of probably introducing someone ...more

Clippings

Thomson had discovered the electron. He, however, called them corpuscles. Thomson speculated these were literally bits of atoms.

Newton’s laws mandated that orbiting electrons had to be accelerating, if they were to remain in their orbits without falling into the nucleus. And Maxw ...more

Ananthaswamy guides the reader through the basic conundrum the double-slit experiment has broken brains with for a couple of centuries, then through all the models that might explain it, especially those since what is called "the Copenhagen Interpretation" (the first Bohr/Heisenberg et al quantum model that predicted subatomic particle behavior with probabilities).

Supposedly Einstein was troubled by two asp ...more

In the two-slit experiment, you shine a light against a barrier with two slits in it then observe what happens as the light hits a screen placed behind the barrier.

If ...more

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ANIL ANANTHASWAMY is former deputy news editor and current consultant for New Scientist. He is a guest editor at UC Santa Cruz’s renowned science-writing program and teaches an annual science journalism workshop at the National Centre for Biological Sciences in Bangalore, India. He is a freelance feature editor for the Proceedings of the National Academy of Science’s “Front Matter” and has written
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“What Born realized was that the symbols Heisenberg was manipulating in his equations were mathematical objects called matrices, and there was an entire field of mathematics devoted to them, called matrix algebra. For example, Heisenberg had found that there was something strange about his symbols: when entity A was multiplied by entity B, it was not the same as B multiplied by A; the order of multiplication mattered. Real numbers don’t behave this way. But matrices do. A matrix is an array of elements. The array can be a single row, a single column, or a combination of rows and columns. Heisenberg had brilliantly intuited a way of representing the quantum world and asking questions about it using such symbols, while being unaware of matrix algebra.”
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“The fact that we are now dealing in probabilities is not, presumably, because we do not know enough about the particle. Matrix mechanics says you have all the information you can possibly have. Yet, if you take a million identically prepared particles in the same state (the same combination of states A and B) and perform a million identical measurements, then, on average, x2 number of times you will find the particle in state A, y2 of the time you’ll find it in state B. But you can never predict the answer you’ll get for any single particle. You can only talk statistically. Nature, it seems, is not deterministic in the quantum realm.”
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