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My question is fairly simple and straightforward. I'm studying Quantum Mechanics, specifically the spinor formalism. I understand that one can define a generator of rotations, say around axis $z$ by an angle $\phi$, by considering the exponential
$$
\mathcal{D}_z(\phi)=\exp\left(-\frac{iS_z}{\hba...
Can I burn a piece of wood by emitting single photons on it? (for example by emitting only one photon per second or per milisecond etc to the wood). How much should be the rate of emitting single photons? How long does it take for wood to catch fire in this way? Are the energy of photons importan...
