Recent content by MichPod

I did not study/read it all, but I was very positively impressed from the first paragraphs. A.I Lvovsky - Quantum Physics, an introduction based on photons Of course it is not only about photons.

Thank you. Thank you for confirming my question has some sense.

Yep. And they also have another version (quite a different one) of this course+videos given by another professor: https://ocw.mit.edu/courses/8-04-quantum-physics-i-spring-2013/

Agree. And I did not mean anything opposite. The mattress has some physical particles connected with springs, then phonons correspond to the modes of the vibration of the mattress as a whole.

There is no any good book on QM unless you already know QM.

Providing the Hermitian conjugation of ##\hat{a}## is ##\hat{a}^\dagger##, this operator is Hermitian (self-adjoint)

To continue, as a discrete approximation we can model a K-G field with some mattress of discrete particles connected with springs. Acting with creation operators on the vacuum (ground) state of that mattress would correspond to adding phonons to the "lattice" of mattress. So I think that asking...

I expected there is an obvious analogy between the x coordinate of an oscillator and the value of a quantum field at particular point. Why was I wrong? BTW, how can I see that the field operator is not Hermitian, as you said? I though it is for the case of K-G equation.

For a harmonic oscillator? Per Schrodinger picture, it is just 'x'. How can I see that the field operator is not Hermitian? I though it is for the case of K-G equation.

Hmmm... interesting. From your impression, is Ballentine more advanced than Sakurai? I understand they both are ranked as graduate level textbooks.

Why the field is not observable? (I expected the value of the field is observable because it is observable in a classical case). Just to be on the same page, we can observe a coordinate of a quantum harmonic oscillator at a specific moment of time, right? By analogy, I though, we can observe an...

Per quantized scalar field (quantized Klein-Gordon equation), suppose we act on a vacuum state |0> with some set of creation operators to have some particles. How then can we calculate a probability density for the field to have a particular value ##\psi_0## (upon measurement) at a specific...

As not too advanced, but good, I can recommend David Miller, Quantum Mechanics for Scientists and Engineers. While providing very accessible approach, it introduces/covers some 90% of standard QM topics + even introduces some advanced topics from quantum optics. Also, Susskind, "Quantum...

I understand that the Wolfram math is the state of the art, top level product in its field, so I am much puzzled seeing this sort of inconsistency.