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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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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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What is the phase difference in a double slit Fraunhofer diffraction? [on hold]

In fraunhofer diffraction, the source is placed in the focal plane of a convex lens and the screen is placed in the focal plane of another lens. The combination of the 2 lens makes the distance ...
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Wave optics YDSE [closed]

In Y.D.S.E. seperation between the two slits S1 S2 is a and screen is at distance x from the slits. Source of light S is moving with velocity v parallel to S1 S2 and is at distance h from S1 S2 . ...
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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 ...
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Once Which-Way information is known, and the photon passes through another double slit, can it become a wave again?

So was thinking if we construct 2 levels of double slit experiments where in the first we know whichway information, and then the same photons pass through a second double slit experiment, will they ...
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Question on Double slit diffraction

In the two-slit interference experiment, how can we determine where a point P on the screen is in the diffraction pattern by giving the maximum or minimum on which it lies or the maximum and minimum ...
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What are Bohmian trajectories for a free electron?

A free electron, or any other quantum particle, has an uncertain position/momentum, according to Heisenberg uncertainty principle. The squared amplitude of the wavefunction determines the probability ...
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Are photons avoiding destructive angles of diffraction in a single photon at a time experiment?

Are photons avoiding the angles of diffraction where destructive interference would occur if they weren't alone in a one photon at a time double slit experiment? Is the number of photons detected on ...
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re loss/gain of energy by particle/wave photon/electron to slit grating

Although an electron or photon wave is meant to just diffuse and interfere, when it hits the screen in a certain diffraction pattern at the end, the particle version would be considered to have ...
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Are photons blinking? [closed]

Is a photon passing through a point in space blinking relative to that point? If the photon for some reason destructively interfere with it self at that point, what happen to it? is it off or ...
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In a pilot-wave model, is knowing the position of the particle sufficient for predicting its behavior?

Suppose that we somehow exactly know the position of an electron before hitting the double-slit structure (for example we know it's 20cm away from the structure and it's closer to the left slit). In ...
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What is the Detector in the double slit experiment and how it works?

What about the "DETECTOR". Is it a passive device or is it just a fictional mathematical prob. I think that detector is somehow consuming the energy responsible for the wave nature of the photons, ...
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What is “quantized momentum transfer”, and can it account for the double-slit experiment?

In https://www.sciencedirect.com/science/article/pii/S0378437109010401, the author claims that the interference pattern obtained in the double-slit experiment does not need a wave description of ...
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Double Slit Experiment : Photon vs Electron

are the following statements correct: For Young's double slit experiment with electrons, the separation between two slits has to be smaller than the position uncertainty of the electrons. But no ...
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Can't we see electrons without affecting their movements? [closed]

Can't we see electrons without affecting their movements? I was thinking about the double slit experiment and something is writing on Feynman's book like photons can affect their movements too. But I ...
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Calculating total number of fringes in Young's Double Slit Experiment

I know that the $n^{th}$ order maxima can be given by $\frac{n\lambda D}{d}$. But theoretically n can go up to infinity and the intensity will go down. However, is there any way to approximate the ...
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1answer
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How position of source affects YDSE interference? [closed]

I was wondering that how position of source of light affects YDSE experiment? I know that path Difference of light after the slits is the reason for YDSE interference pattern observed, but how path ...
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Change in position of maximum with the angle of source light in YDSE

One of my friends named Karan, asked me the following question: This question puzzled me for an hour. (an hour is much when your Boards exams are the next day) I want to know how I can accurately ...
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1answer
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In the double-slit experiment, why don't slits destroy interference pattern?

In the double-slit experiment with electrons, if a detector is placed in one of the paths to show where the electron is passing, the wave nature of the particle is lost and you have no interference. ...
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Magnetic field in double slit experiment using electron beams

Say I have an experimental setup like this for a double slit experiment using an electron beam instead of light. There is a magnetic field coming out from the plane of paper. So will we get an ...
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Why aren't particles constantly “measured” by the whole universe?

Let's say we are doing the double slit experiment with electrons. We get an interference pattern, and if we put detectors at slits, then we get two piles pattern because we measure electrons' ...
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About YDS experiment and their one case

When we put the complete YDS in a medium having refractive index u what happen when we introduce a glass slab then what will happen in shifting of Central bright?
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Holograms and Entanglement: Does recording an entangled signal in a hologram “observe” the entangled state?

Suppose I have two photons $A$ and $B$, which are entangled. As I have had it explained to me, entanglement works more or less as follows: I observe or measure $A$, and find $A=S_a$, where $S_a$ ...
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Double slit diffraction derivation

The task is to derive the intensity pattern of a double slit diffraction, where light travels along the $z$-axis, the point of interest lies on the $x$-$z$ plane, the slits are wide (in $z$-direction) ...
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1answer
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Double-Slit Experiment with Dissimilar Photons

When scientists fire a string of single particles rather than a random scattering of them, the effect of non-interference/interference remains. Now, let's suppose that we have a particle source that ...
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Delayed Choice Quantum Eraser - what is erased?

I fail to see why everybody thinks that something is erased in the famous Delayed Choice Quantum Eraser experiment (see https://arxiv.org/pdf/quant-ph/9903047.pdf and https://en.wikipedia.org/wiki/...
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Notation question about double slit interference pattern

I know that the conditions for constructive/destructive interference are given by the following equations: $$\text{Constructive:} \space \space \space d\sin{\theta}=n\lambda \\ \text{Destructive: }\...
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In Young's double slit experiment, can you get the deaf spots larger than the loud spots?

I'm trying to get the strong spots, to be very little larger, same size, or smaller, than the weak spots. Is it possible?
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double-slit experiment showing faster than light information transfer?

In the figure shown below, a laser sends a continuous stream of a large (almost infinite) number of photons per second at a double slit, and the photons are then are displayed on a screen. The upper ...
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can entangled photons produce an interference pattern?

Suppose you have a laser that emits entangled photons in opposite directions towards a double-slit screen setup as shown below. The photons are entangled such that if a photon on the left travels ...
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Why are my interference patterns completely out of phase?

DIY physics enthusiast here doing a double slit eraser experiment at home with a laser pointer, double slit diaphragm, and few linear polarizers (horizontal at one slit, vertical at the other, +/-45 ...
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Double silt experiment with one circular polarizer in front of only one slit in the which-way perspective?

If one puts in front of a double slit two quarter-wave circular polarizers (QWP) in front of each slit, say one with 45° and the other with -45° orientation (fast and slow axis - i.e. clock- and anti-...
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1answer
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Double slit experiment: why does the barrier between the slits not collapse the wave function?

During the double slit experiment the electron passes through both slits, how come the material between the two slits does not collapse the wave function and we get an interference pattern? On the ...
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What happens if separation between slits is greater than separation between slits and screen in YDSE experiment?

I was studying Young's double slit experiment (YDSE) in which it was derived that the formula for path difference ($\delta x$) is : $$\delta x = \frac{y \cdot d}{D}$$ Where $y$ is the vertical ...
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Interference pattern and slit

Three questions about interference pattern and slit. (i) In the 1-slit experiment, an interference pattern is observed if the slit is wide enough (a narrow slit gives a rather blurred interference ...
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Double slit experiment record but not look at it

I am having a tough tough stressful week trying to write an article about quantum mechanics. I know there was a question asked the same thing before, but I didn't understand nor I did not want to wake ...
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1answer
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Double slit experiment with only ONE detector [closed]

Suppose one sets up a double-slit experiment, but with only ONE detector behind one of the slits (the left one, let's say). Now suppose the dots that appear on the screen are ERASED (by the ...
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Why can‘t the Double Slits Experiment be explained by a Particle?

I simply don‘t understand why the assumption that light moves as a Wave makes more sense than that it moves as a Particle... (I know that the assumtion is more about light „sometimes“ being a Wave, ...
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Does simply putting a photon-splitting crystal after a double slit break the interference pattern?

A modified version of the quantum eraser experiment, consisting of just a photon source, double slit, photon-splitter crystal and a screen, capturing one of the entangled twins. No detectors, no ...
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Double slit experiment and Dirac Sea of electrons

Imagine a sea of electrons which is so tightly packed that exclusion principle comes into play, next I remove 1 electron from this sea... this hole should behave like a particle and is positively ...
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Modified double slit experiment

Imagine instead of an opaqe screen with 2 slits, we have a mirror with 2 slits. Would this produce an interference pattern both on the screens behind and in front of the mirror? We still don't know ...
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Would the fringe spacing be the same if the slits were at different positions in Youngs double slit experiment?

If the experiment was set up as shown in the image below, where the two slits are at different distances from the screen, would the fringe spacing still be y = ($\lambda)*L/d$ where $\lambda$ is the ...
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1answer
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How are Young's double slit experiment and speckle patterns related?

I know that when light from a laser is reflected from a rough surface onto a screen, it produces a speckle pattern. I believe, a Fourier transform of the intensity distribution of the speckle pattern ...
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Double slit experiment/ fitting data to complicated sine function and vice versa [closed]

As part of analysing the double slit experiment, I've recorded position values for a number of minima and the central peak position. Also, I've conducted a single slit experiment (with unknown width)...
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Background illumination and noise/Double slit experiment

I have obtained a value for the background illumination with an associated error which was kept constant during a double slit experiment. Also, I have acquired a value for the average noise/...
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Using entanglement for communication based on the double slit experiment [duplicate]

When we perform a double slit experiment we receive interference pattern. when we measure in a specific slit the exact location of the photon (or electron) the interference pattern disappears and we ...