What Does the Principle of Least Time Have to Do with Quantum Physics?

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Physics Explained is a channel that explores advanced topics in physics without skimping on the mathematical detail. There is a growing community of independent learners who are keen to explore modern ideas in physics with the aid of mathematical reasoning. This channel aims to tackle advanced topics head on whilst at the same time providing a historical narrative to help provide context to the ideas. A bit about my educational background: I have a PhD in theoretical physics, specialising in string theory. I now dedicate most of my my time to physics education. You can help support this channel via the Physics Explained Patreon account: https://www.patreon.com/physicsexplained