Tagged Questions
2
votes
1answer
38 views
State emitting from an extended thermal source
This calculation is for a double slit experiment setup which is experiencing a far field radiation from an extended monochromatic thermal source. I assume the source is 1-D and it's length is $b$. ...
2
votes
1answer
59 views
Does the observer or the camera collapse the wave function in the double slit experiment?
Ok so if we setup a camera before the slit we will find a single photon and will follow through accordingly, likewise by having a camera setup after the slit, we can retroactivly collapse the wave ...
6
votes
4answers
252 views
Interference and which-path information
My understanding is that in a double-slit experiment, quantum interference disappears if which-path information is available. How is available defined? Consider the following experiment:
SPDC is used ...
0
votes
1answer
52 views
First order coherence through double slit
The state $$|\Psi \rangle = |0\rangle + \sum_j \int d\omega f_j(\omega)\hat{a}^\dagger_j (\omega) |0\rangle $$ is coming from a far field and incident on a double slit setup. Here j is the index of ...
0
votes
1answer
86 views
Probabilistic vs Statistical interpretation of Double Slit experiment
Why is it assumed that the results seen in the double slit experiment are probabilistic and not just a statistical result of some unknown variable or set of variables within the system.
1
vote
1answer
52 views
double slit experiment with two opposite quarter waveplates
Consider the usual double slit experiment involving laser and a double slit and a screen. Now place in front of the left slit a quarter waveplate (let's call it QWP1) that changes a certain linear ...
1
vote
2answers
87 views
Double slit experiments - basic pondering
I have some ponderings about the double slit experiment(s) and mainly their interpretations. Some of my questions may exhibit insufficient scholarship so please bear along, or please point out the ...
-2
votes
1answer
147 views
Quantum Mechanics proved incorrect. Bohr - Einstein debates concluded?
"Photons act like they go through two paths, even when we know which they took".
Please refer the above link and its conclusion.
I am an Engineer. What I infer from this is :-
This proves ERP.
...
1
vote
0answers
39 views
How to make DIY flight detector for double slit experiment?
I want to reproduce double slit experiment. So, is it possible to build flight detector (situated near one slit) at home? Is it possible to buy it somewhere?
1
vote
1answer
104 views
Is the following a simpler viable alternative to Feynman's interpretation of the double slit experiment
Feynman suggested that there is an infinity of trajectories for a single electron travelling from the source to the phosphorescent screen. He said that one electron goes through both holes (Fig 4.10, ...
8
votes
3answers
614 views
Is it possible to reproduce Double-slit experiment by myself at home?
I want to reproduce this experiment by myself. What I need for this. What parameters of slits and laser/another light source it needs? Is it possible to make DIY-detector?
0
votes
1answer
107 views
Young experiment: square of classical real wave function
I can't understand why the sum of two real waves result in a time dependent wave, but not so for the complex waves.
In details, I can't get this passage on p.38-39 in A.C. Phillips, Introduction to ...
3
votes
5answers
644 views
Connection between quantum physics and consciousness
Can someone explain the quantum physics-consciousness connection? In the double slit or quantum eraser experiments, the system behaves as a whole, with some apparent time independent traits. Invoking ...
2
votes
2answers
139 views
In a double slit experiment are any particles lost because they hit the space between the two slits?
In its wave-form a particle should pass through every time because it propagates in all directions. So there shouldn't be any losses of particles landing in between the slits, right?
4
votes
3answers
257 views
What is the experiment where subatomic particles appear to foresee the future?
I've seen a documentary, whose name I don't remember but I'm curious because it suggests that subatomic particles are able to "foresee the future".
I'll try to describe it here:
Some particles are ...
1
vote
2answers
206 views
Double slit experiment alternating holes
If we perform the double slit experiment by shoting photons covering one hole at a time, would we see equally the double slit interference?.
That is, the same set up of double slit but fire photons ...
2
votes
4answers
803 views
Can an electron be in two places at the same time?
So I've been reading a bit and watching some videos about the double slit experiment, and therefore the wave particle duality; I've also read this "implies" that a particle can be in two places at the ...
3
votes
2answers
118 views
Probability wave speed of dispersion and interference
I'm a layperson learning about quantum mechanics and probability waves. My understanding is that the probability wave for the position of a particle disperses throughout all of the universe.
I have ...
7
votes
2answers
392 views
Solving the Schrödinger equation for the double-slit experiment
I'm not sure if this is the right place to ask a question about the Schrödinger equation, but I'll take my chances anyway. Basically, I would like to know how one can set up a potential function that ...
0
votes
0answers
46 views
An idea about the simultaneous observation of wave and particle property of light [closed]
It is well known that in a double-slit experiment with single photon source, one can not obtain the which-way info and interference pattern at the same time, since a detector placed behind one slit ...
1
vote
1answer
130 views
On the double slit experiment with 4 slits
I'm not a physicist nor a science savvy person, but I was wondering if this experiment was ever performed in a simultaneous fashion on screens with fixed references(marks) and firing different ...
1
vote
2answers
369 views
One-photon-at-a-time effect on double slit experiment with detectors?
I do not have a access to a physics lab, nor have I come across this type of a double slit experiment, hence I am curious if someone has tried this.
Given a double slit experiment setup with a ...
0
votes
3answers
394 views
Single photon and double-slit experiment
Laser fires single particles of light, called photons, through the slits. Even though only single photons of light are being fired through the slits and They create three pattern again. How single ...
4
votes
4answers
640 views
Why does observation collapse the wave function?
In one of the first lectures on QM we are always taught about Young's experiment and how particles behave either as waves or as particles depending on whether or not they are being observed. I want to ...
-2
votes
3answers
283 views
Is it the act of measuring a quantum particle that causes it to lose its uncertainty?
I have designed an experiment. Without going into detail it resolves around the double slit quantum eraser experiments. If we can infer the location of a particle without actually measuring it, does ...
5
votes
3answers
297 views
Triple slit experiment
If the experiment is done with single photons and a "detector" at one of the slits the interference pattern breaks down.
What happens if three slits are used with single photons and a "detector" at, ...
1
vote
1answer
95 views
Matter wave of multiple particles of different types
I am slightly getting confused on the following issue:
When performing double-slit experiment of electrons, a screen allows the matter waves to be detected as particles. And as we all know that ...
2
votes
3answers
157 views
How to observe a particle with indefinite position?
As I understand it, when physicists talk about something behaving both like a particle and a wave, what they mean is that it has momentum like a particle, but its position is determined ...
2
votes
1answer
128 views
Deducing from the double slit experiment that electrons mostly behave like particles
I saw this video of a lecture by Feynman where he said that electrons behave like particles when there is a photon source to detect which slit they pass through. Does this imply that electrons mostly ...
2
votes
2answers
238 views
What is the relationship between distinguishability and probability in Quantum mechanics?
Firstly I am sorry for any awkward English expressions.
Recently I'm reading "Feynman Lectures on Physics - Quantum Mechanics" and come to have a single question.
In the book Feynman explains, "You ...
2
votes
1answer
91 views
How would a semi-classical particle react to the double slit experiment?
As far as I know, there is a smooth transition between quantum and classical regimes, so that even classical particle like a massive object has a wavefunction associated with it. However, the double ...
1
vote
1answer
207 views
What happens in this revised double-slit experiment?
Put the classical electron-emitting double-slit apparatus in a sealed box. At each slit there's a counter to check whether an electron has passed it or not, so had the apparatus been left in open, we ...
1
vote
1answer
707 views
what is phase angle of wave function $\phi \,$?
this is wave function:
$$\Psi{(\vec r, t)}=\Psi_0 e^{i(\vec k \cdot \vec r-\omega t)}$$
$$\Psi{(\vec r, t)}=A e^{i(\phi + \vec k \cdot \vec r-\omega t)}$$.
what is phase angle $\phi$ of wave ...
2
votes
1answer
56 views
Does classical physics predict the effects of shining a laser at a hair?
The discussion on this webpage mentions that shining a laser beam at a hair produces an effect like that of the double-slit experiment. Does classical physics predict the effect you observe when you ...
1
vote
1answer
289 views
How Light or Water Intensity is equal to square modulus of wave function of Light or Water Waves $I=|\psi|^2 \,$?
I've seen the Wave Function as a psi $\Psi$ $\psi$.
And always heard that the wave function is the Complex Number as Imaginary and real number.
But I've never seen it
I've never seen components of ...
0
votes
3answers
770 views
The Double Slit Experiment and the changing of electron behaviour
As you will all know, when one tries to detect which slit an electron has gone through with close up observation, it changes from behaving like a wave and producing an interference pattern to behaving ...
3
votes
4answers
174 views
slit-screen and wave-particle duality
In a double-slit experiment, interference patterns are shown when lights pass through slits and illuminate the screen. So, the question is if one shoots a single photon, does the screen show ...
3
votes
1answer
131 views
Can spatial coherence be maintained in fiber optic cables over time?
I am doing research with a double slit experiment, using a beam splitter and 2 lengths of fiber optic cable, whose ends brought close together form the effective double slit. I notice that the ...
3
votes
2answers
210 views
Decoherence when no one is looking?
I understand that in the single-electron-at-a-time double slit experiment, if a detector is placed before the slit, the interference pattern vanishes.
Suppose I left the detector on, but put a bag ...
1
vote
4answers
404 views
Questions on wave-particle duality
Wave-particle duality states that a particle has both wave properties and particle properties when one is not observing it.
1) What is an observer? Need it be anything living or can other particles ...
1
vote
3answers
238 views
Double slit experiment and indirect measurements
In the classic Young double slit experiment, with slits labeled as "A" and "B" and the detector screen "C", we put a detector with 100% accuracy (no particle can pass through the slit without the ...
4
votes
2answers
250 views
Accuracy of various optical instruments
I understand that this may not be the type of question allowed here, but I'm not sure. Feel free to close this if you feel that it shouldn't be here
I'm planning on carrying out a certain set of ...
0
votes
2answers
277 views
Entanglement and the double slit experiment
Is the double slit experiment an example of entanglement when it seems as if the photon is going through both slits? Or put another way, is it at this stage when we attempt measurement we see a photon ...
3
votes
2answers
554 views
Double-slit experiment simulated with water waves?
We all know the explanation videos and other material using the water waves analogy to illustrate the propagation of electrons or photons and the interference patterns measured in the the single-slit ...
2
votes
0answers
182 views
In Scully and Druhl delayed choice quantum eraser experiment, are there limits to the lengths of the delay?
I'm in humanities, not physics, so please bear with me. I am trying to understand this experiment and have a few unanswered questions. I have read the other posts on this site that discuss the ...
3
votes
2answers
128 views
In the dual-slit experiment, can the time it takes for a photon to arrive reveal the path it took?
It seems like this experiment is possible:
Fire a photon, and start a timer
The photon travels through the slit(s)
The photon strikes a plate -- the timer is stopped.
Based on where on the plate ...
1
vote
1answer
102 views
What kind of interactions denote 'observation'?
I'm quite perplexed by the notion of 'observation' in regards to the collapse of a particle's probability wave. Does a particle's wave only collapse when it is involved in a strong interaction (such ...
2
votes
6answers
350 views
Do we really know which slit the photon passed through in Afshar's experiment?
The plain old double slit experiment displays interference when we don't measure which slit the photon passed through, and no interference when it is measured. Let's turn our attention to the case ...
4
votes
4answers
670 views
Variation of delayed choice quantum eraser
Let me base the discussion on the pictorial description of the delayed choice quantum eraser experiment on wikipedia.
First suppose that we do precisely the same thing with the lower parts of the ...
6
votes
10answers
526 views
What exactly is the 'observer' in physics and/or quantum mechanics? [duplicate]
Possible Duplicate:
nature of an observer
For instance, in the double slit experiment, what is exactly defined as an observer?
I remember from somewhere, light is also an observer?
