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seen Aug 24 at 10:57

Jul
17
comment correlation function of coherent states
Could you elaborate a bit further (or give a reference) on what is g_n exactly? Or do you by any chance mean the nth order correlation function $g^{(n)}$ ?
Jun
16
comment Massless Pulley and direction of it's clamp
Take one body at a time and forget all others. In the dual pulley configuration, let's focus on only the left pulley. The things that are physically interacting with this pulley are 1) the cord, which is trying to pull it down and to the right, and 2) the clamp. The pulley is however stationary. So the only way this can happen is if both the vertical & horizontal forces cancel. Which would mean... ?
Jun
12
revised According to calculations why the current of a battery of a mobile is high?
I stands for current, 'current intensity' if you like but current is important
Jun
12
suggested approved edit on According to calculations why the current of a battery of a mobile is high?
May
27
comment Limits on the information obtained through optical measurements
$S1$ and $S2$ are as such different lasers so in practice, they can of course be distinguished, e.g., their central wavelengths may differ by a few kHz. I am trying to ask if the information obtained through measuring them could prove sufficient enough to render them indistinguishable with the proposed gedankenexpt. And if so, is this indistinguishability just classical in nature? Or does it exist on the quantum level too?
May
27
revised Limits on the information obtained through optical measurements
revised the central question
May
27
comment What can change a photon's frequency?
@ConstantineBlack: All implementations of QFC that I am aware of have been realized as nonlinear processes which require special materials and intense optical pulses. Light-matter interactions of these kind can almost never occur in nature by themselves, so yes, it's pretty much a lab phenomenon.
May
25
comment What can change a photon's frequency?
The process of quantum frequency conversion can, at least in principle, simply change the frequency of a single photon while preserving its quantum properties.
May
25
asked Limits on the information obtained through optical measurements
Apr
22
answered Polarized Filtering Frequency Shift?
Feb
22
asked Question about electron-hole pair generation in depletion layer for a p-n junction photodiode
Feb
11
comment How would a quantum computer receive input from a classical computer?
Insert a grad student between the classical computer and the quantum computer.
Feb
10
comment How are the field operator and quantum state after a beam splitter and a polarizing beam splitter individually?
For a non-ideal PBS, the situation would of course be more complicated. Nonetheless, my feeling is: if you can properly model the action on a single photon with arbitrary polarization, then the action on an arbitrary state could also be evaluated (should be a few lines of code).
Feb
10
comment How are the field operator and quantum state after a beam splitter and a polarizing beam splitter individually?
It shouldn't be a problem for an ideal PBS. The basic transformation would be as follows: $|m^a_H, n^a_V ; p^b_H, q^b_V \rangle \rightarrow |p^c_H, n^c_V ; m^d_H, q^d_V \rangle$, with $m, n, p, q$ denoting arbitrary photon numbers, the superscripts [subscripts] denoting the spatial [polarization] modes. Since you can represent any state in the Fock basis, the above transformation for some multiphoton state containing both polarizations can also be accordingly evaluated.
Feb
8
revised How are the field operator and quantum state after a beam splitter and a polarizing beam splitter individually?
Added figure and reference.
Feb
8
comment How are the field operator and quantum state after a beam splitter and a polarizing beam splitter individually?
@LuZhang : I've updated the answer with a figure and a reference. Hope that helps!
Feb
8
revised How are the field operator and quantum state after a beam splitter and a polarizing beam splitter individually?
Added figure and reference.
Feb
5
comment How are the field operator and quantum state after a beam splitter and a polarizing beam splitter individually?
@LuZhang: I wrote an answer. Let me know if that clarifies your doubts.
Feb
5
answered How are the field operator and quantum state after a beam splitter and a polarizing beam splitter individually?
Feb
5
comment How are the field operator and quantum state after a beam splitter and a polarizing beam splitter individually?
You don't need any prefactors for a polarizing beam splitter (PBS), i.e. $\hat{a}_{\rm out1} = \hat{a}_{\rm H}$ and $\hat{a}_{\rm out2} = \hat{a}_{\rm V}$. An ideal PBS will always transmit [reflect] all the horizontally [vertically] polarized photons.