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 experiment question. Time travel? [closed]

What would happen if I look at the detector final screen first and then looked at the slit screen? Would the reading of the final detector screen tell me which ones of the slit screen data I am going ...
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In the Young's Double Split Experiment, how does the intensity of fringes vary with distance?

My Physics textbook introduced the topic with considerations of only the interference of the in-phase waves and leaving aside the property of diffraction for the later part. This way it plotted the ...
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Does a single photon diffract when fired at a single slit?

A beam of light fired at a single aperture produces a diffraction pattern on the screen. A beam of light fired at a double slit produces an interference pattern. Individual photons fired at a double ...
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Young's double slit and determinism

In Cohen-Tannoudji's QM book, pg. 6, the following was said about the Young's double slit experiment: Moreover, as the photons arrive one by one, their impacts on the screen gradually build up the ...
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Why are these peak intensities in Young's experiment the same?

I took the following image from the book Sears and Zemansky's University Physics with Modern Physics by Young and Freedman. I don't understand why the relation $d = 4a$ makes the peak intensities in ...
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Double slit experiment with which-way detector

Basically I am not satisfied with the answers to this question. The question is asking for records (images, videos) of the double slit experiment with a which-way detector. And although the answers ...
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Explain Elitzur-Vaidman in MWI

What happens in the experiment according to MWI? When do world splits happen in a Mach-Zender Interferometer in the many world interpretation with a dud bomb? At the first mirror? Then how come the ...
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In the Double Slit Experiment, what is the longest time $T$ recorded between shots of particles, electrons, photons, etc.?

How can we be certain that electrons fired do not leave some kind of residual interference for the next shot? What is the longest time recorded between shots?
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What is the physical interpretation of the wave function in the Many Worlds Interpretation of Quantum Mechanics?

In the Copenhagen Interpretation of Quantum Mechanics (QM), the mod-square of the wave function gives us the Probability Density Function (PDF) of the quantum object. Is there any such meaning for the ...
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Is my understanding of the double-slit experiment correct?

I'm no quantum scientist. I'm just a software engineer with a healthy (?) fascination with quantum mechanics and knowledge gained from Googling. :) I've read many different articles about the double-...
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If I made a double slit using microwave oven door, do I get an interference pattern?

Imagine the following setup: A microwave oven door with 2 holes big enough for the wavelength of microwave to pass through, high power magnetron as the source of microwave and wall of metal to produce ...
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Can molecules used in double slit experiments interact with light? [closed]

If a photon hits a molecule while it's in a wave state will it collapse it into a particle?
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DIY Experiment fiasco: Single slit laser pointer already showing interference pattern

I tried to run the double slit experiment at home for my kid with a cheap red laser pointer. I partially covered the laser with four pieces of electrical tape to make a tiny square hole. To my ...
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What is the predicted outcome of this quantum eraser experiment?

This YouTube video demonstrates a doable-at-home quantum eraser experiment. To summarize in brief, a laser is shined through a double-slit, causing an interference pattern on a white poster 3 meters ...
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Particle interference

According the experiments of interference of the particles one by one*, we see that it is the distribution of the impacts of all the particles on the screen (detector) which draws (constructs) the ...
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Has a double-slit experiment with detectors at each slit actually been done?

My understanding of the famous double-slit experiment is that, when both slits are open, a wave-pattern interference arising from the two slits is observed. This is a different pattern than summing ...
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To observe a particle in the double slit experiment, do I need to shine light on it?

In the double slit experiment, it is important whether a particle is observed or not. Does observation mean I illuminate my particle actively, making photons interact with it and look what comes back, ...
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How to determine the angle for constructive interference of incoherent light in Young's double slit experiment?

I understand that we would need to consider the phase difference to answer this question but I am unsure of how to do so.
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How to explain double slit fringes experiment using the fact that light is electromagnetic in nature?

Huygens principle explains the double slit fringes experiment, by assuming that each gap (or slit) behaves as an individual light source, but according to EM (electromagnetic) theory, we can't assume ...
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Is the double slit pattern a standing wave?

This question is about terminology. The double slit pattern has nodal lines and antinodal lines, and therefore resembles a standing wave. However, the antinodal lines within the double slit pattern ...
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Can electromagnetic waves with long wavelengths (1 kHz to 1 GHz) also be considered as Photons?

Could we conduct the Double Slit Experiment with long wavelengths (e.g. frequencies between 1 kHz and 1 GHz) and still measure through which slit the wave/particle goes? I am sure that the ...
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Electric field at detector in double-slit experiment

I am currently working through Knight & Gerry "Introduction to Quantum Optics" and struggle with the following. The setting is an ordinary double-slit type of experiment, i.e. we have a ...
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Home lab double slit "where to get lab quality slits?" :)

I purchased a small light table demo kit from thorlabs and I would like to setup a double slit demo. Thorlabs does not sell any double slits, and I am having a hard time finding a vendor that might ...
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Why does quantum physics use "observation" rather than "interaction" as the term for the trigger which collapses the wave function?

So I understand that when talking about quantum mechanics, quantum entities are assumed to exist as a probability wave, until they are "observed", which collapses the wave function into an ...
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In Young's double slit experiment, do we observe fringes to a limit? [closed]

As fringes are observed due to diffraction at two sources and diffraction has a particular area to cover. So we should be getting fringes only upto certain distance?
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Adding a divider plate to double slit experiment

In the double-slit experiment, what happens if we install a divider plate behind the slits, perpendicular to the slits' plate, and continue for halfway before the target screen? Would we see an ...
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A single photon in double slit experiment

Could somebody explain the results of the following experiment (please no conjecture/interpretation, only observation)? In the double-slit experiment, if we shoot a single photon (not a series of ...
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How does the photon detector in this experiment work?

https://www.youtube.com/watch?v=Cg7jMXQHxvM At 5:46 to 6:37 Dr. Aspect talks about photon detectors. At 6:10 he talks about firing single photons at a time, and having two detectors. From what I have ...
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Can we see the interference pattern in the double slit experiment if the walls of the slits are made of transparent glass?

There are other questions on this site about when we put one of the slits in glass, or cover one of the slits with glass. I am not asking about that, and none of those question answer my specific ...
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How does the double slit experiment ensure phase coherence?

I am quite unsure of how phase coherence is ensured in the double slit experiment. The most typical answer that I have found is that the path length difference between the lights going in either ...
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In the delayed-choice quantum eraser experiment what is the pattern at D0 if the beam splitters at the which path detectors D3 and D4 are removed?

Let me first, as a reference for my question, show the graphical description of the delayed choice quantum eraser experiment and explain my understanding of it. This is the experimental setup: My ...
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Delayed Choice Quantum Eraser - what is seen on a screen placed at the main signal detector D0?

In the Delayed Choice Quantum Eraser experiment shown below, $D_0$ is a photon detector that is moved by a motor along the $x$-axis. What would be seen on a screen placed there?
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How to find double a certain double slit experiment?

I read about a double slit experiment where the detector clicks when a photon goes through the slit. When the detector doesn't click, it means the photon must have gone through the other slit, and a ...
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Double Slit Experiment with detector on the double slit screen itself

I’ve looked for a version of the double slit experiment in which the detector (of photo, electron, etc.) is also placed on the slit screen itself, the side facing the emitter. Thinking: As we know, ...
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How does the photon detector in this video work?

In this video: https://www.youtube.com/watch?v=A9tKncAdlHQ How does this photon detector at 6:58 work, mechanically speaking? Is this basically just like a camera, that beeps when it is hit by light? ...
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Trying to understand the delayed-choice quantum eraser: can the experimenter decide whether the which-slit information is erased or not?

I'm trying to understand the delayed-choice quantum eraser experiment as described here: https://en.wikipedia.org/wiki/Delayed-choice_quantum_eraser#The_experiment_of_Kim_et_al._(1999) My knowledge ...
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Does the size of the mark a photon/electron leaves on a light sensitive sheet change with distance?

This video shows an electron detection event build up. https://www.youtube.com/watch?v=hv12oB_uyFs When firing photons or electrons at a light sensitive sheet (or whatever types of detectors are used),...
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What is the cut off size that starts producing interference pattern in a double slit experiment? [duplicate]

Firing bullets produces just two bands. Firing elecrons or photons produces interference pattern. What is the biggest object that produces interference pattern and the smallest one that produces two ...
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Why is there a single slit in the Young double-slit experiment? [duplicate]

I am studying waves these days and my teacher just introduced Young double-slit experiment, which has always been brilliant (see picture below). However, I have a question: why is there a single slit ...
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In the double slit experiment, would a gravity detector cause wave function collapse?

In the double slit experiment, if a sufficiently sensitive instrument capable of detecting the gravity of the passing electron were used in place of a photon, would this cause wave function collapse? ...
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EPR communication with double slit

I know this is probably not possible to use to communicate via EPR, so my question is why? I create electron entangled pairs using pair production or some other method, (each color pair is an ...
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Will tennis ball produce same interference pattern in double slit experiment if everything was scaled up?

Assume the same experimental setup as double slit experiment with electron but everything is exactly scaled up in size so that electron is replaced with tennis ball. Now we throw tennis balls at ...
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Minimum distance for two parallel beam to interfere effectively

Following is an illustration of two parallel monochromatic beams interfering in Bragg's law experiment. For these two rays to interfere, what is the minimum distance OF required? I understand that the ...
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Double Slit: Collected Data Versus Gedanken

To frame my question, I'd like to present two example quotes from articles on the double slit experiment written in respected (or at least widely read) publications: One from Quanta: Stranger still, ...
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Fabric of reality shadow photon partitioned off into parallel universes among themselves?

In fabric of reality interpretation of QM chapter 2 how does David Deutsch conclude that the "shadow photons" in the one-particle-at-a-time double slit experiments are themselves ...
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How does wave-particle duality explain the interference pattern? [closed]

The screen is the Y axis and the line perpendicular to it is the X axis. We fire an electron with a well-defined momentum $p_x$ in the X direction. Shouldn't the x-co-ordinate of the particle follow a ...
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Particle- and wave-like properties

Is wave-particle duality a real concept or a pedagogical tool? In a less opinion-based way: what are particle properties and wave properties of a particle (that we speak of particle properties of ...
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How does the particle's total energy affect the interference pattern? Individual Particle Double Slit Experiment

Double slit experiment with individual particles has been performed with a variety of particles from photons to molecules of up to 2000 atoms. For photons, as the frequency increases (i.e. wavelength ...
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Would the central fringe in the Double Slit Experiment be less populated if we negatively charge the spot between the two slits?

Would the the interference pattern in the Double slit Experiment with electrons look different if we make the point between slits charged? Would the patterns elongate or would the distribution among ...
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Has any double slit experiment been performed near 0 kelvin?

That would provide us information on the effect of random atomic vibrations on the interference pattern, as well as on the states of matter. Did we perform such an experiment? If yes, did we observe ...

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