I have a question regarding the interpretation of the Wightman quantum field in mathematical quantum field theory. A quantum field $\phi$ is a operator-valued distribution. This means that $\phi$ is a linear function $$\phi:\mathcal{S}(\mathbb{R}^{n})\to L(D,\mathcal{H}),$$ where $S(\mathbb{R...

If we make $\triangle$x really small, then in order to not break the Heisenberg uncertainty principle the photons will need to change momentum($\triangle$p), so where is it getting the energy to deviate? I know that wave function says that the position of the photon is probabilistic but still i...

As I understand it, when papers and books refer to "Cavity QED" they simply mean the strong coupling regime of two-level system to a photon field in a resonator, i.e. Jaynes-Cummings and variants thereof. In other words, I could understand the whole problem using standard quantum optics. Indeed, ...

My college recently switched to whiteboards. Though writing on a whiteboard with a black ink sounds similar to the conventional way of writing with white chalk on a blackboard, it feels very different. At least for me as a student, blackboards used to be a much better experience. Physically, are...