Hello,
I've been trying to find <p'|φ(x)|p> for a free scalar field. and integral of <p'|φ(x)φ(x)|p> over 3d in doing the space
In writing φ(x) as
In doing the first, I get the creation and annihilation operators acting on |p> giving |p+1> and |p-1> which are different from the bra state |p>...
Here's a weird question where I don't quite know if length contraction or time dilation play a role.
Say I have 2 spaceships moving towards each other. rest length of spaceship A is La and spaceship B is Lb. The pilot in A determines that time taken for the spaceship B to traverse the length...
Three questions,
In a femtosecond laser, or any laser for that matter, how is a pulse generated from noise? how do the phases match up? we use modulation for this? if so, what kind?
Also, how does a laser get self mode locked when you push it or 'kick' it from the back? what does this...
okay, i understand that. but if i were to hypothetically gate an already attenuated source, from say a tubeligand gate it in time and space such that i allow exactly one quantum state. One photon. Then that would be it, right? Physically may not be possible, but theoretically!
sorry for the delayed response. I was out of town. Thank you for all this. You've been a HUGE help in understanding this.
Why is it that i cannot attenuate a laser enough to generate single photons . I understand that it's a quantum state. but if i were to space and time gate a tubelight. then...
also, you suggested using a pseudothermal Martienssen lamp. why this? why won't light from any thermal source suffice to display correlations? is noise the problem?
so the n here represents the no of counts of photons in each arm. am i right? joint detection rates depend upon ensemble average of detection at each arm <n^2>. say one photon has been detected in detector 1, given this, in a small time tau, we are looking at detector 2, which has an probability...
thanks a lot. lastly, I must ask, the quantum interpretation of this is still not very clear to me. I have read a couple of things about 2 sources and 2 detectors, and they probability of photon at detector 2 being released by source 1 or 2, or a superposition. But is there any concrete way to...
If you were to NOT sample the same field. And if you were to look at the 2 detectors, for joint detection. Then <:n^2:> wouldn't become <n(n-1)> right, because the mean detection rate at each detector is still n. this comes in after the detection of one photon right, so for the detection of the...
Thank you so much for your responses. They have been incredibly useful and cleared some doubts. However one thing I am still not absolutely certain of is that why do fermions and bosons act differently? Is it because of what property of their wavefunction?
Also, in setting up the hbt expt, the...
I've visited a great many sites and looked at papers to fully understand this, and still have some confusion regarding the Hanbury Brown and Twiss effect.
Classically, speaking, we treat photons as waves. the math yields a correlation function which boils down to a constant term and a cos...