Questions tagged [double-slit-experiment]

The double slit experiment involves passing light through two parallel slits to demonstrate that the light from one slit interferes with that from the other.

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Double Slit Eraser - does the wave function collapse and restore or never collapse

This video shows a rudimentary double slit eraser experiment. He sends photons through a double slit with a polarization film before the double slits (with a 90 degree difference) to obtain "which-way"...
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Scully’s DCQE paper 1999 - reasons for phase shift

http://Arxiv.org/abs/1103.0117 Or better Google the paper using string: arxiv:quant-ph/9903047v1 In order to “see” (detect) the interference pattern we have to take care about the shift of Lambda ...
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Confusion regarding the reasoning for why constructive interference is hard to determine in Single-Slit Experiment

We know that the location of dark spots in Single-Slit experiment is given by the following equation: $$m\lambda = d\sin\theta$$ Where $m = 1,2...$ $d$ is the width of the slit and $\theta$ is the ...
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Diffraction: What actually happens in the slit

I’m not a physicist but a curious reader, and I’m trying to understand the slit experiment it all makes sense if I accept that the slit itself has no active affect ... can any one explain what ...
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Double Slit with almost identical QWPs

As brought in a previous question, a classic double slit experiment will show an interference pattern at the detector. If one adds quarter wave plates before the slits such that each wave plate ...
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Multi electron interference in double slit experiment

Electrons have negative charge, and therefore repel each other. That should mean that their position, and momentum probabilities should get skewed away when in the presence of some other electron. I.e....
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Are Robert Lanza's claims on Quantum Mechanics in his book “Biocentrism” accurate?

in his popular (pseudo-science) book Biocentrism ch.8 (see here, scroll down to "the most amazing experiment") Biologist Dr.Robert Lanza makes a number of assertions on quantum mechanics based on ...
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Double slit experiment with quarter wave plate and polarization detector

I read in a book the following assertion. In a double slit experiment photons are passed through the slits and detected at the end plate. Each of the two slits has a quarter wave plate which alters ...
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Time of detection for single-electron double-slit experiment

Consider the single-electron double-slit setup, where an electron gun fires a single electron, and a dot is observed on the detector screen behind the slits. We do not place any detector in the slits. ...
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In Young double slit experiment, if whole of the space between the slits and the screen is filled with some optical medium (excluding air and vacuum)

Then a slab is introduced in front of one of the slits. What will be the path difference offered by the slab? The equation must be, according to my school teacher: $$\left({n/n'-1}\right)p=d\sin\...
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If I know in advance I'm getting an interference pattern, wouldn't I have time to remove the splitter so the which-path information would be know?

Check the image below, from this excellent explanation of the quantum delayed eraser. My question, and please forgive me if it is a naive one, is that first the photon reaches detector A, which tells ...
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Would the results of the Double Slit Quantum Eraser be the same using massive particles?

I'm wondering if the double slit quantum eraser experiment would produce (or does produce, if it's already been done) the same results if massive particles were used instead of photons. My reason ...
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Quantum Key Distribution via Modified Double Slit Experiment

Here's my reasoning: Setup 1: Take a traditional double slit experiment and turn on the photon source. Interference fringes should appear on a detector screen placed opposite the photon emitter, ...
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Envelop Experiment question

The following is an extended version of the Delayed Choice Quantum Eraser called "The Envelope Experiment." This may be referred to as the "sealed envelop" or "very delayed quantum eraser." See ...
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Can there be interference between a proton and an electron?

For example, we know that we can interfere two different electrons or two different protons by employing them in a double-slit experiment. Now suppose, we mix protons and electrons and shoot them ...
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Colored fringes in Young's Double Slit Experiment (YDSE) using white light

Suppose we use a monochromatic light in YDSE. We observe the regular type of fringes of mainly the same color and they fade away as the distance from central maxima increases. But with white light we ...
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Delayed Choice Quantum Eraser with one additional detector at the slits?

Please take a look at this experiment https://en.wikipedia.org/wiki/Delayed-choice_quantum_eraser#The_experiment_of_Kim_et_al._(1999) . You can also look at this youtube video https://www.youtube.com/...
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Proof for shapes of fringes on complete screen

I recently studied about fringe patterns due to interference and we learnt to calculate position of Central Maxima etc. At the end of a reference book I saw that the shape of fringes on a complete ...
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Projecting double slit onto fog instead of screen [duplicate]

In the quantum mechanical double slit experiment, the resulting pattern is projected onto a screen. This is an important part of the experiment, because the screen represents the quantum mechanical ...
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Does this thought experiment proves that Standard Quantum Mechanics and Pilot Wave Theory make different predictions?

Here is a thought experiment that is supposed to show that standard quantum mechanics and pilot wave theory do not make the same prediction : Take the double slit experiment, and add a detector in ...
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Are superposition quantum systems really in two pure states at once?

I know that quantum systems can have properties of waves as well as those of particles. Also, I know that the mathematical description of quantum states is probabilistic, i.e. $$\Psi = \frac{1}{\sqrt{...
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Double sit experiment and Uncertainty

If we try to an electron with a high energy photon, we precisely detect its position, while its momentum becomes totally uncertain. On the other hand, if we detect it using a low energy photon, its ...
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How did scientist get photos of wave function of electron in the double slit experiment?

In the double slit experiment I know that the electron fires as a particle one at a time then splits goes through both slits and recombined and interferes with itself and hit the wall creating a ...
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Diffraction pattern vs Interference pattern

I am not confused with difference between Young's double slit experiment and diffraction. In Young's double slit experiment, the interference pattern is bright fringes separated evenly with ...
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Would a million slits experiment works?

I read that in triple or more slits experiment, the particle can sometimes though lower probability of going through all the slits and interfere with itself many times at once? I used to think it is ...
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Single photon interference, state “top” current theory [duplicate]

Is there a simple generally accepted explanation for single photon interference? Does each photon interact with or see both slits?
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Why Delayed choice quantum eraser doesn't produce two lines

As I understand, a Double slit experiment produces interference pattern or two broad distributions on the detector based on observation. Does delayed choice quantum eraser produces the same patterns ?...
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How can a bright fringe be not as bright as a dark fringe in YDSE? [closed]

The book says that the last bright fringe in the interference pattern within the central maxima in the diffraction envelope can not be seen as it cannot be as bright as the diffraction dark fringe. ...
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Can you help me clear up the double slit experiment?

So I know what happens in a double slit experiment and that if you put an observer, it changes the outcome of the experiment. It has to do with Heisenberg's uncertainty, but how does his uncertainty ...
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Double-slit diffraction: is $x$ measured from the centre to the fringe, or between the fringes on either side?

In using the formula $\lambda = \frac{ax}{D}$, is $x$ (the fringe separation) measured from the centre to the fringe, or between the fringes on either side of the centre? In other words, in the ...
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Timing in double slits experiment

In this setup the source, the slits and the screen are a lightsecond away from each other. I would like to know if there is any difference if I tempered with the slits before and after the photon is ...
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Quantum eraser without the quantum eraser

I've recently watched PBS SpaceTime's video about the quantum eraser. In it, Matt describes a kind of crystal that splits particles into pairs and entangles them. The entangled particles are then ...
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Question on the double slit experiment

Out of curiosity I wanted to ask what people think about this idea. I understand that when we do the double slit experiment and observe the particle, we get a wave collapse because of the observed ...
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Confusion regarding path difference by glass lab in YDSE

If in a YDSE experiment the setup is immersed in a medium $n_{med}$, and a glass slab of thickness t of another medium $n_{glass}$ is introduced in front of one slit, then is the path difference due ...
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Trying to understand quantum physics double slit experiment [closed]

I have watched many videos and read many articles and it says that a particle is acting like a wave. So why we try to understand on which hole the particle went through? Clearly a wave will pass ...
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How can a double slit interference pattern be created without out going through a double slit

When I create a double slit in a mirror by removing the paint and silver I get a beautiful interference pattern. What’s interesting to me is that I get one in the opposite direction too. What has me ...
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Does wave-particle duality rely on accepting the Copenhagen interpretation?

If you're a scientist that subscribes to the many worlds theorem, does that mean you do not accept wave particle duality? Seeing as MW postulates that the wave or particle form has always existed that ...
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Young slits, mirrors and interference patterns [duplicate]

Why do Young slits projecting via an intermediary mirror to a screen still shows the normal pattern of interference? This happens even though the mirror is so close that not all interference is ...
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Young's double slit experiment - fringe width [closed]

What is the main difference between fringe width and fringe breadth?
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Double slit experiment with separate light sources?

Hi I'm stuck on a conceptual question I am working on which has frustrated me as I'm not sure I still understand this topic but essentially the question is asking: You complete a Youngs double slit ...
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How to visualize double-slit interference w/ object creating path difference?

A thin flake of mica (n = 1.58) is used to cover one slit of a double-slit interference arrangement. The central point on the viewing screen is now occupied by what had been the seventh bright ...
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Physics Young's Double Slit Problem

In a Young's Double Slit experiment, the separation of four bright fringes is $2.5\ mm$, the wavelength of light used is $6.2 \cdot 10^{-7}\ m$. If the distance from the slits to the screen is $80\ cm$...
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Interference of two lasers in a double slit [closed]

I was wondering if there is any interference between two lasers shot at the same time through a double slit.
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Why is a point source required for observing perfect double slit interference?

What would happen with a non-point but coherent source (some kind of ideal flashlight which produces perfectly coherent light for example)?
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Why are photons particles and waves, instead of particles that simply move in a wave pattern?

I understand the double slit experiment, but even with the results, why are photons determined to be particles and waves at the same time, instead of particles that move in a wave pattern? In bodies ...
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Does the thickness of a slit play a role in the fringe pattern of either the double or single slit experiment?

So it is widely known that the width of the slit affects the interference pattern. And the double slit experiment is a demonstration of the wave nature of light. But i could casually see how the ...
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Why do the two slits of a double slit experiment not make light coherent and create an interference pattern if monochromatic light is passed through? [duplicate]

If a narrow slit makes monochromatic light coherent, why is light required to pass through the single slit before the double slits in Young's experiment? Wouldn't the double slits individually make ...
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Double slit diffraction

In the intensity pattern of double slit there are two terms one for single slit diffraction $\sin^2a/a^2$ and another is double slit interference $\cos^2b$.In the intensity pattern of double slit ...
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If you pass light through a double slit and back through the same slit again is there an interference pattern or particle pattern?

If you pass light through a double slit and back through the same slit again (say by using mirrors to bounce it back around) is there an interference pattern or particle pattern? I'm curious what ...