Questions tagged [quantum-eraser]

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Why does the signal detector D0 in the delayed choice experiment always show a blur?

As explained in many answers such as https://physics.stackexchange.com/a/516512/64051, the delayed choice quantum eraser cannot be used to send information back in time because the detector D0 always ...
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Quantum Zeno Effect and Many Worlds Interpretation (Plus Quantum Eraser)

What's the Many-Worlds interpretation of the Quantum Zeno effect and does its interpretation somehow relate to the Many-Worlds interpretation of the quantum eraser experiment? If so, how? I know this ...
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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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Is This Quantum Eraser Video from Fermilab Incorrect?

In a video from Don Lincoln of Fermilab here, the following claim is made about a quantum eraser-type setup (about 2 min 50 sec in): "If A & B are turned off, you see a wave pattern. That ...
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Why Do We Ever Get Interference in a Quantum Eraser?

There are many questions on this site about the quantum eraser, but I think mine is not quite answered by any of the other answers on the topic. Here's the setup: My understanding of this experiment ...
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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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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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DCQE: is SPDC low rate fundamental?

Preamble: I'm quite aware I've been duped by sci-pop videos and maybe the Wikipedia. I'm asking this question precisely in order to correct the Wikipedia article and to make my own video debunking the ...
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Quantum eraser experiment. Can we "theoretically" switch on and off the interference pattern instantaneously?

Quantum eraser experiment is explained in this youtube video in a basic way. Correct me if I am wrong but I understand it like this: Detectors A and B are placed further from the splitting crystal ...
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Why do quantum eraser and original double-slit setups produce different patterns on the detector?

A similar question has been asked here, but there was no answer: Why Delayed choice quantum eraser doesn't produce two lines I learned that in the original double-slit experiment, an interference ...
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How long does it take to register different impacts in the Double-Slit Experiment?

Consider a Double-Slit Experiment with a lens between the slits and the screen. The lens focuses the interference patterns in such a way that R01 + R02 = D0. When a measuring device is put at one of ...
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Has or could the delayed-choice quantum eraser be explained by relativity of time, the timelessness of photons moving at lightspeed?

This question probably will or should be substantially revised...or even deleted and completely overhauled. As far as I understood it the delayed-choice quantum eraser has always been done with ...
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In the delayed choice quantum eraser, do future entangled photons being detected affects signal photon in the past?

The way I understand delayed choice quantum eraser is the puzzling issue, how the future entangled photons being detected or not effects the behavior of the signal photon in the past? If I understand ...
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Could the quantum wave function collapse under these settings?

I am wondering if this type of experiment been done. You observe the phenomenon either by the usual double slit exeprimenet and by delayed choice experiment. You record the which way path as usual. ...
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Quantum eraser data?

Is there a website where I can get data from a quantum eraser experiment? I'm look for raw count data from the detectors.
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If humans can be shrunk down to the quantum level, does this mean that the shrunk human will experience time slower as they have smaller mass? [closed]

I am doing some research about "time travelling" by shrinking humans to the quantum level. It's something based on the delayed choice quantum experiment, so that we can go back to the past ...
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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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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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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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Simplified delayed choice quantum erazer experiment: is it possible to create an interference pattern at D0?

I have a follow-up question to Interference pattern in delayed choice quantum eraser and Does simply putting a photon-splitting crystal after a double slit break the interference pattern? (Wikipedia: ...
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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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Modified delayed choice quantum eraser with a game of rock paper scissors

Okay, I came up with this great idea to intuitively understand retrocausality which is implicated in the delayed choice quantum eraser experiment. Alice and Bob have decided to do an experiment. If ...
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Why is there a π phase shift in Fig.4 compare to R01 shown in Fig.3?

About Kim 's delayed choice quantum eraser experiment. Is it possible to adjust the phase of interference fringes from $D_1$ and $D_2$ by adjusting the distance of $D_0$ screen?... Shouldn't they ...
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Delayed Choice Quantum Eraser variation results

If we were to start with the delayed choice quantum eraser setup in the attached image, what would the interference pattern look like for the photons at D0 if D3 and D4 were eliminated (and the two ...
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Alternative to the "eraser" in the Quantum Eraser experiment?

I haven't seen any literature on the difference between erasing the photon's which-slit information vs just hiding it forever. Erasing quantum-information is effectively just a perpetual quarantine ...
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Why do we need a lens in the delayed-choice quantum-eraser experiment of Kim?

This is the delayed-choice quantum-eraser experiment of Kim diagram described on Wikipedia https://en.wikipedia.org/wiki/Delayed-choice_quantum_eraser Why do I need a lens in front of the ...
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Is a quantum eraser instantaneous?

I'm going through the basic and popular optical quantum-eraser experiment with laser and polarizers and I have a question. After applying the diagonally aligned polarizer at a 45 degree angle, the <...
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Delayed choice quantum eraser experiment involving light and polarization filters

I read a post about trying Young's double slit experiment at home, and the first comment suggested a DIY delayed choice quantum eraser experiment. In the video, they use two polarization filters on ...
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In the Delayed "Choice" Quantum Eraser experiment, what is observed between detection of the signal photon and the idler photon?

It is mentioned in the study that: In the experiment the optical delay (LA,B 2 L0) is chosen to be 2.3 m, where L0 is the optical distance between the output surface of BBO and detector D0, and LA ...
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Quantum Eraser Mars Communicator and Alien Detector!

Build a Quantum Eraser Mars Communicator (QEMC) with one detector E on Earth and another detector M on Mars. The detector M also has an eraser QE which can be turned on or off by Elon Musk on Mars. ...
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4 votes
3 answers
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Help creating a DYI delayed-choice quantum eraser experiment for teens

We're planning the science fair for my wife's high school later this year (if the quarantine allows us...). We are looking into doing this simple quantum eraser experimenter from Scientific American, ...
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Delayed choice quantum eraser for communication [closed]

I know entanglement communication is kind of the "perpetum mobile of quantum mechanics" but I still can't give it up. Here's a setup: Make 10000 entangled photon pairs at T0 and let them loop in ...
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Can this setup produce a no interference pattern from entangled photons from a BBO crystal?

Related question from physics exchange where the pictures were taken: From the delayed choice eraser paper from Kim et al. 1999 My question is probably quite simple. I want to know if changing the ...
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What do quantum eraser actually do?

From what I know it basically erases which path information so even though the detectors still interact with the photon, but not able to tell which path the photon takes the result is a interference ...
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Delayed choice double slit experiment

I want to be certain, was there an experiment ever performed, like, where if we do not look at the screen and then the detector at the double slit destroyed(which path information is lost). And then ...
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Conclusions from the delayed choice eraser double slit experiment?

Is it safe to say the point of all of these one particle slit experiments is that the very existence of "which way" information is what collapses the wave function even in the case that information ...
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What Prevents Delayed Choice Quantum Eraser Experiment from Being Used to Predict the Future?

Reading about the DCQE experiment commentary by Ross Rhodes. My question is: why can't information about the future state of the idler photon (the one that heads toward the Glen-Thompson prism) be ...
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3 votes
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Do "delayed choice" experiments send information back in time?

Consider the wave function collapse of a pair of entangled photons: wave function is collapsed, let's call this state '0' normal wave function, let's call this state '1' In a "delayed choice" ...
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What if you turn the photon detector on after the paired photon has already gone through both slits?

Id imagine the answer will be that even if you turn the photon detector on after the paired photon has already hit the screen, the screen will show no interference pattern because the universe sensed ...
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3 votes
3 answers
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Are photons locked in time, and does this explain the "delayed choice quantum eraser" experiment?

I'm trying to wrap my head around the "Delayed Choice Quantum Eraser" experiment and how events in the future affect light in the past. I'm sure I'm wrong but to me this seems to indicate that ...
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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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When does quantum entanglement cease?

On Wikipedia on Quantum entanglement: “However, this behavior gives rise to seemingly paradoxical effects: any measurement of a property of a particle performs an irreversible collapse on that ...
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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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Delayed erasure (Kim experiment) [duplicate]

In Kim experiment https://en.wikipedia.org/wiki/Delayed-choice_quantum_eraser I take out all the beam splitters, mirrors, and detectors for idler photons. But I leave idler photons travel freely in ...
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Delayed erasure experiment [duplicate]

Lets assume that in the delayed eraser in Kim experiment https://en.wikipedia.org/wiki/Delayed-choice_quantum_eraser#The_experiment_of_Kim_et_al._(1999) we can split the original photon into 2 photons,...
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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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Delayed eraser experiment (Kim experiment)

Will I receive an interference pattern on D0 detector https://en.wikipedia.org/wiki/Delayed-choice_quantum_eraser#The_experiment_of_Kim_et_al._(1999) if D1, D2, D3, D4 exist in the set up of the ...
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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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