Following a lecture by David Wallace from Balliol College, Oxford, on “The World(s) According to Quantum Mechanics”, I thought I’d share the beduzzling theorems and problems it presents.
As a quick introduction, even though light travels in waves (that’s why it can’t go round corners, remember?), it’s also a kind of particle that comes in little chunks, or quanta, that we call photons. You can’t get half a photon, so the smallest bit of loght you can get is a photon. Pretty simple.
That part makes sense. What surprised the scientists when they were working with these tiny particles, though, is what happens next.