The double-slit-experiment tag has no wiki summary.
12
votes
6answers
611 views
Particle wavefunction and gravity
Suppose a particle has 50% probability of being at location $A$, and 50% probability being at location $B$ (see double slit experiment). According to QM the particle is at both $A$ and $B$ at the same ...
11
votes
5answers
799 views
Double slit experiment near event horizon
What happens if you perform a double slit experiment near an event horizon, if one of the slits is outside, one is inside the event horizon?
11
votes
6answers
1k views
Tried to do the double slit experiment, failed. Why?
I tried, and failed, to do the double-slit experiment. I thought I had a good experiment setup, but obviously I was wrong. Can anyone offer some insight in what I might have done wrong? Most of ...
8
votes
3answers
690 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?
7
votes
2answers
395 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 ...
7
votes
1answer
569 views
What are the specific requirements for a do-it-yourself quantum double-slit experiment?
I was shocked to recently learn that the double-slit experiment is not only possible to do with completely ordinary equipment (with photons of course), but it actually looks rather easy. This is from ...
6
votes
3answers
2k views
Is Dr Quantum's Double Slit Experiment video scientifically accurate?
I'm fascinated by the fundamental questions raised by the Double Slit Experiment at the quantum level. I found this "Dr Quantum" video clip which seems like a great explanation. But is it ...
6
votes
3answers
319 views
Is it possible to define a “it went through two slits” observable?
This concerns the famous two-slit experiment. Electrons or photons or your favorite particle, doesn't matter. As we all know, the attempt to detect which slit the quanta pass through leads to loss ...
6
votes
2answers
498 views
How do electrons interact if one of them had just exited the two slits of the double-slit experiment?
Consider the following experiment: a double-slit set-up for firing electrons one at a time. Let's now add a second electron (orange), which is fired parallel to the first one, but in the opposite ...
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 ...
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?
5
votes
3answers
300 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, ...
5
votes
1answer
262 views
How to mathematically formulate the Two Slit Experiment in Special Relativity?
How to mathematically formulate the Two Slit Experiment in a Lorentz invariant framework.
Is there a paper about this?
4
votes
4answers
644 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 ...
4
votes
4answers
507 views
Two slit experiment: Where does the energy go?
In Physics class we were doing the two slit experiment with a helium-neon red laser. We used this to work out the wavelength of the laser light to a high degree of accuracy. On the piece of paper the ...
4
votes
1answer
137 views
gauge invariance and Bohm-Aharanov effect
I am confused with the Bohm-Aharanov effect: though quantum mechanics is said to be gauge invariant, the presence of a solenoid imposes a gauge ... I used to think that a phase shift did not change ...
4
votes
2answers
251 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 ...
4
votes
2answers
120 views
How can a single slit diffraction produce an interference pattern?
How can a light passed though a single slit produce a similar interference pattern to the double-slit experiment? How does the diffracted wave produce the points of cancellation and reinforcement, if ...
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 ...
4
votes
1answer
108 views
Young's double slit experiment viva question
My professor asked me (in my viva exam), "If, in the Fraunhofer single slit diffraction experiment, if we have 2 slits instead of one (at very short distances), What would happen?"
I answered with ...
4
votes
1answer
205 views
Young's double slit
Am I right to think the (general) probability distribution of photon in a double slit experiment at the screen has the form $|\psi|^2 = c e^{\alpha x^2}\cos^2(\beta x)$? (Due to the superposition of ...
4
votes
3answers
258 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 ...
3
votes
5answers
667 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 ...
3
votes
2answers
129 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 ...
3
votes
1answer
87 views
Use and understanding of higher-order correlation functions
The correlation function g1 is pretty easy to understand and the relation to young's double slit experiment is also clear to me.
In every quantum optics book I read so far correlation functions ...
3
votes
6answers
914 views
How is the double slit experiment modeled in contemporary physical theories?
Suppose I have the following double split experiment set up:
a monochromatic electron source of low intensity, which we can model as emitting a single electron at a time with energy $T$.
a ...
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 ...
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
2answers
557 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 ...
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 ...
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 ...
2
votes
2answers
657 views
Electron behavior changes when observed?
I saw this video of the double slit experiment by Dr. Quantum on youtube. Later in the video he says, the behavior of the electrons changes to produce double bars effect as if it knows that it is ...
2
votes
2answers
361 views
Is Time Significant in the Double Slit Experiment
When doing the classic double slit experiment is the time between emitting photons significant at all? Say, a single photon is emitted, the scientist waits T seconds, then emits another photon. Are ...
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 ...
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?
2
votes
3answers
442 views
Defining Measurement in Quantum Mechanics
I should begin by saying that I am a total newbie when it comes to Quantum Mechanics. Therefore my question might sound metaphysical to people who know their stuff. So please forgive.
What I am ...
2
votes
4answers
827 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 ...
2
votes
3answers
160 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
3answers
980 views
Why is the central maximum the brightest?
This is a question directly from a homework sheet, however I can't find any decent answers online so hopefully someone can help!
In single slit diffraction, why is the central maximum double the ...
2
votes
1answer
95 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 ...
2
votes
1answer
438 views
Double slit experiment - how to see an electron going through a slit?
This is my first question here. Hope it not too dull to you guys :p
I found this video on youtube. After 3:24 it says if there is an observer detecting which slit the electron goes through, there ...
2
votes
1answer
39 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
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
239 views
Quantum phenomena near black hole event horizon
I wanted to re-open the question of quantum measurements across event horizons. If I set up two slits or more generally a diffraction grating which crosses a black hole event horizon, and I shoot a ...
2
votes
1answer
60 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 ...
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
4answers
609 views
Young's double-slit experiment with detectors
Related: Accuracy of various optical instruments
In many books, it's written that knowing which slit a photon passes through (by placing a detector before the slit) in a Young's double-slit setup ...
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 ...
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 ...
1
vote
5answers
1k views
Hidden observers in Double Slit experiments - Do they matter?
I'm still struggling a bit with some ideas around double slit experiments. One that keeps cropping up for me is the role of observers.
Imagine a classic double slit experiment with a hidden observer ...
