Through Two Doors at Once / ·
The Elegant Experiment That Captures the Enigma of Our Quantum Reality
Cover design: Daniel Lagin
An experiment: What would you expect to see on the screen?
“Depends on what one thinks is the nature of light” — Light as particles
A bucket of sand as a metaphor for where the particles should land on the screen
The double slit experiment: Overlapping waves of light create an interference pattern
Discrete photons of light shot one-at-a-time also create an interference pattern!
With the discrete photons, the fringes appears random at first, but emerge over time
An electromagnetic wave
The photoelectric effect
Figuring out which path the electron took — an apparatus imagined by Albert Einstein and Niels Bohr in a thought experiment from the 1920s
Alain Aspect and Philippe Grangier’s setup of a Mach-Zehnder interferometer (step-by-step)
Single photons are either reflected or transmitted through a beamsplitter
50% of the photons head to detector D1, the other remaining to detector D2
A second beamsplitter is added exactly at the point where the two paths cross
Alain Aspect’s experiment setup to test for Bell’s Inequality
Lucien Hardy experiment with two interferometers, based on Elitzur-Vaidman bomb paper
Dirk Bouwmeester experiment setup based on Roger Penrose interferometer design
Aephraim Steinberg’s experiment setup for weak measurements, to reconstruct particle trajectories through the double slit experiment
Graphics created for Through Two Doors at Once: The Elegant Experiment That Captures the Enigma of Our Quantum Reality, a popular science book by Anil Ananthaswamy.
Through Two Doors is a survey of the quantum world—its mechanics, the scientists who study it, and various interpretations that have been put forth—as revealed by the Double-Slit experiment and its many modern-day variations (such as those with the Mach-Zehnder interferometer and beamsplitters). 38 unique illustrations complement the book’s text—including optical diagrams, schematics of experiment setups, and visualisations of recorded observations.
“[The] illustrations were well done throughout—minimalist not to distract, but with helpful guides to each iteration of the various experiments.” — David Kaiser, MIT, author of How the Hippies Saved Physics
| Year: | 2018 |
| Publisher: | DUTTON |
| ISBN: | 978-1-101-98609-7 |
| Book text and illustrations © Anil Ananthaswamy. Book interior layouts by Daniel Lagin |
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