Quantum Optics and Least Action

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Presentation transcript:

Quantum Optics and Least Action Physics 202 Lecture 10 Quantum Optics and Least Action

Fermat’s principle: the path a ray of light takes the least amount of time to travel

Hamilton’s principle: the path a physical particle is the path of least action

Feynman’s rebuilds optics via least action and particles of light (photons)

The “grand principle” of QED: phasors characterize the probability of the action

The “general rule” of QED: the true path is the phasor sum of all possible paths

Incredibly, these ideas explain all of optics and quantum mechanics

Electromagnetism comes from charged particles exchanging photons of light

What’s new: anti-matter annihilates matter in a burst of light and vice versa

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