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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Optics numerical based Young's double-slit

In Young's double-slit experiment, the phase difference between two interfering beams is (pi/2). If the wavelength of light is 580 nm, calculate the path difference between the interfering beams.
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Was the double slit experiment tried with slow light?

On wikipedia it is stated that light has been slowed to 17 m/s: In 1998, Danish physicist Lene Vestergaard Hau led a combined team from Harvard University and the Rowland Institute for Science which ...
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Why does quantum mechanics “collapse” without the uncertainty principle?

In Feynman Lectures on Physics, Volume III: Quantum Mechanics, Feynman says "The uncertainty principle 'protects' quantum mechanics. Heisenberg recognized that if it were possible to measure the ...
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Why is coherence time the integral over (negative) infinite delay time?

Let $\vec{E_{1}}$ be a wave of the some profile. To observe the interference between these two waves, of the same profile, at different times, $t$ and $t + \tau$, the autocorrelation function $ \xi(t) ...
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How to enforce only 1 photon at a time in double slit

Excuse my noobishness here, but I'm trying to understand the double slit experiment exactly. The way I understand it is the weirdness lies in the fact that when you send single photons through a ...
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How sensitive is double-slit result to a fixed wavelength?

I was watching a video on the double-slit experiment, and the lecturer (*) mentioned, in passing, that the frequency of the waves must be kept the same. (Still in the context of water waves at this ...
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Young's Double Slit Experiment and particle nature [duplicate]

What happens if we really dim down the light in young's double slit experiment? How does the result relates to particle nature of light?
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Introducing two different slabs in Young's double slit experiment

Suppose there are two slabs of refractive indices $n_1$ and $n_2$ kept in front of the sources of light with wavelength λ as shown, how do we calculate the distance of the first bright fringe from the ...
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Double slit experiment confusions

In the past I have read about the double slit experiment and I just barely understood it and I am wondering if someone could put it in simpler terms and explain the results and what they mean.
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How is it that a particle's wave function is not a real thing, yet we can still observe it?

In the double slit experiment, scientists could see an interference pattern on the back panel. However, if the wave function is purely a mathematical object, how can it be the case that some physical ...
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Doubt regarding intensity received at a point

I came across a problem which is as follows: Screen S is illuminated by two point sources A and B. Another source C sends a parallel beam of light towards point P on the screen (see figure). Line AP ...
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Diffraction grating of light

Although I could understand the basics of single slit diffraction, diffraction grating seems something confusing to me. In diffraction grating, we know there are a lot of slits within a unit length. ...
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Is, in the “double point-source experiment”, an interference pattern visible in the vertical direction?

A double-slit experiment is performed where the slits are replaced by small circular apertures with a very small diameter (compared to the distance to the screen). An interference pattern is observed ...
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Isn't the double slit experiment in itself considered a sort of measurement?

According to the Copenhagen interpretation, in the double slit experiment photons/electrons act as waves until measured, that's when the wave function collapses and they act as particles. But isn't ...
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Why does the intensity of the bright fringes decrease as we move away from the central maxima in Young's Double Slit Experiment?

I studied that in Young's Double Slit Experiment the variation of intensity ($I$) of the fringes on the screen with respect to the phase difference ($Φ$) is given by : $I = 4I_{0} \cos^{2}\frac{Φ}{2}$ ...
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Does the material of the screen affect the interference pattern of the electrons in the double-slit experiment?

The question comes from thinking about the way how the screen material affects the interference pattern. Let's say that half of the screen was from one material and the other half from different ...
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How the wave functions of large molecules behaves in the double slit experiment?

I recently saw an article which described how researchers had gotten a molecule with hundreds of atoms to preform the the double slit experiment and confirmed that even structures of that size had ...
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Double slit experiment: effects of changing path difference between slits on diffreaction pattern

I know that interference pattern maxima occur due to path difference of integer number of wavelengths, causing constructive interference, and minima due non-integer number of wavelengths, causing ...
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Double slit interference question a level physics [closed]

The question attached asks you to calculate the angle between the central fringe and the second bright fringe. The mark scheme says that you should use tan to work out this angle using the distance ...
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How does which-slit information destroy interference?

How exactly does which-slit information destroy interference? I've seen in so many places online claiming: "which-slit information destroys interference pattern"..."the act of ...
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Why can't particle nature of light shows Young double slit experiment? [duplicate]

I mean a single light ray can be comprise of many photon so its easy to understand the separation of light in two separate rays No. Of photons are entering through ¹st slit and No. Of photon through ...
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Delayed choice quantum eraser and changing the past?

I've been trying to get my head around the delayed choice quantum eraser experiments (see Kim et al. (1999) and Wiki for details). Many sources online claim that the experiment indicates ...
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Single slit and double slit interference

I skimmed this and this about the title subject but I am still unclear. What are the differences and similarities between single slit and double slit interference patterns?
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How to calculate the fringe visibility on a second screen?

consider the usual Young double slits experiment with charged particles. Here there is an additional which path device giving partial information so that on the screen, the intensity is $A(x)(1 + \...
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Numercial simulation of the double slit experiment

Originally I had a code that simulates single slit diffraction: parameters for functions: ...
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Electron double slit thought experiment

If you do an electron double slit experiment (with one electron at a time), you get an interference pattern as usual. I am wondering what would happen if you scattered a photon (with a given energy) ...
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Testing objective vs. subjective collapse for double slit

Suppose we have double-slit experiment. Before the right slit, we add a particle detector that allows the particle to go through. It is well-known that if we carry this out, then the wave ...
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What happens if we double the slit width of just one slit, in Young's double slit experiment?

If the width of one slit is doubled, but that it is still much narrower than the distance to the screen, what happens to the intensity distribution that we see on the screen? I have been reading some ...
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Quantum eraser variant using a Stern-Gerlach magnetic field to direct the spin states of an electron towards one or the other of two slits

Consider a device consisting of a Stern-Gerlach apparatus (minus the detector screen), Hadamard gate, double-slit, and screen in sequence, tuned to direct electrons with spin up along a predetermined ...
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Position of Central Maxima due to multiple path differences in YDSE

In a YDSE experiment, the apparatus is immersed in a liquid of refractive index μ1. And also one of the slits (S2) is covered with a transparent slab of refractive ...
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When does a collapse occur?

For example, in the double slit experiment, we shoot a single photon at two slits and see where it hits on a screen. We measure the time interval between when we sent the signal to emit the photon, ...
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Probabilities in two slit interference

I'm reading Higher-order interference in quantum physics by Rozema et al. Their Figure 1 is a simple setup There are two paths. The upper path $|u\rangle$ is open and the lower path $|d\rangle$ is ...
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Interference between electrons in double slit experiment

Here I use interfere and interference to refer to an interference pattern of probability waves. With interact I mean all kinds of interactions. It is experimentally proven that an interference pattern ...
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Could mesuring particles in double slit experiment with gravitational waves work?

From my basic knowledge of quantum physics I know that what makes the double slit experiment hard to understand is the mesurement part. Once you mesure a particle you become part of the wave function ...
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Double-slit diffraction: Reduction of intensities

In a double-slit experiment, why do the intensities of the interference maxima decrease with the increasing diffraction angle?
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What effect do particles in superposition have?

Say, with the double slit experiment, in the space between the slits and the wall, what effect does the particle have on those in the air? Is the momentum so spread out to not be measurable with the ...
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Modified double slit experiment - what will happen?

The attached illustration is a schematic of a slightly modified double slit experiment. Detector D1 detects photons arriving from the upper path, D2 does the same for photons arriving from the lower ...
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Is the wave function of an electron connected to the fact that it behaves as a wave near a double slit?

I know this is a very basic question but I am wondering if the wave function of an electron is connected to the fact the electron behaves as a wave and we have interference in the double slit ...
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Is the Bohm-Aharonov effect a proof of real $U(1)$ local gauge transformations “taking place” (instead of being just a math procedure)?

Under a local gauge (phase?) transformation of the field operator for electrically charged fields, $\psi \rightarrow e^{\mathrm{i}\phi(x_{\mu})}\psi$, where $e^{\mathrm{i}\phi(x_{\mu})} \in U(1)$, the ...
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In the single-shoot, double slit experiment, does the screen register one corresponding particle for each one fired or more than one each time?

This info is crucial for my research. Are there any experimenters here who actually did the experiment and can confirm if this is the case?
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Why can't we decompose the position wavefunction differently?

If I understand correctly, we see the electron appear as a point on the detector in the double slit experiment because the position basis vectors are orthogonal. This ensures that we will only see one ...
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Understanding decoherence in the double slit experiment [duplicate]

I am trying to understand how decoherence explains the observation of only one possible outcome rather than observing the superposition. When the electron goes through the two slits it interferes with ...
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How does the electron understand that it being observed in the double slit experiment?

I was reading about the double slit experiment that proved the wave and particle nature of electron. I read that electrons give a diffraction pattern when they are not observed (wave nature) and ...
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Double-Slit with Polarizing Filter

A polarizing filter is placed in front of each slit with the two filters aligned perpendicularly to each other. My question is why does the produced pattern not have any dark bands? In terms of what ...
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Is there interferences between 2 electron wavefunctions?

The 2 slits experiment done with 1 electron shows interference from the "splitted" wavefunctions. EDIT: as precised in an answer, it is after many electrons goes in the experiment that the ...
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Has the double slit experiment with classical projectiles ever been performed?

I was wondering if the double slit experiment with mascroscopic objects has ever been tried. In any course of quantum mechanics, a way to introduce quantum effects is to introduce the double slit ...
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How do you prove the particle went through both slits?

I'm only a casual reader so maybe i misunderstood something so far but here is my current understanding: The pattern we see from the 2 slit experiment emerges due to two probability waves, one ...
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Unplugging the detector in the quantum double slit experiment

I'm thinking about the quantum double slit experiment. Specifically the part where if you had a detector pointing at one of the slits, this would collapse the wave function and the interference ...
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Do double slit experiment with big balls [duplicate]

if we do the double slit experiment but we shoot metal balls in a closed box so we don't observe. what pattern comes then on the board? if i understand correctly there will be no interference pattern ...
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Quantum Erasure - what causes the phase difference in the two interference patterns observable at Do?

In the Delayed Quantum Erasure experiment, I understand that the interference patterns that you would see at Do is associated to the entangled photons that eventually arrive at D1 or D2 (which-way ...

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