Experiments · The Celestial Code

Two slits, one photon at a time

Each photon leaves a single dot on the screen. Without a detector the dots follow the square of the sum of two amplitudes, with fringes; with a detector at the slits, the sum of two probabilities, with none. The setup is simplified; the probabilities are the textbook ones.

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The Celestial Code · Chapter 3

A Photo Costs Energy

In 1937, a twenty-year-old Claude Shannon defended a master’s thesis later called “possibly the most important master’s thesis in history.” He proved something engineers shrugged at first — and then built digital civilization on. The gist: an electrical switch is a “yes” or a “no.”…

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