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Questions tagged [quantum-eraser]

The quantum-eraser tag is used for questions related to quantum eraser experiments, which are a type of quantum interference phenomenon that involves erasing or restoring the which-path information of a quantum system. Quantum eraser experiments test the fundamental principles of quantum mechanics, such as complementarity, entanglement, and causality. Questions tagged should be about the theoretical or experimental aspects of quantum eraser experiments,

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Quantum eraser experiment in enclosure if data is not recorded, destroyed, or encrypted

I'm trying to understand something precisely and finding it difficult to trust videos on YouTube, conversations on Reddit, etc. This existing question actually comes very close to mine: Quantum eraser ...
Andrew Cheong's user avatar
-2 votes
2 answers
86 views

Can I use a delayed choice quantum eraser to see into the future? [closed]

From what I understand about the delayed choice quantum eraser is that (per the diagram below), an interference pattern will be seen on D0 if a photon hits the last detectors D1 and D2 where they are ...
Alexander Kleinhans's user avatar
1 vote
2 answers
72 views

Why is there no overall interference pattern with a delayed choice quantum eraser?

Consider a delayed choice quantum eraser: There is an interference pattern at D1. There is an interference pattern at D2. There is no interference pattern at either D3 or D4. I also understand there ...
cuckoo's user avatar
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2 votes
3 answers
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If two people perform the double slit experiment, why does the pattern disappear for both if only one observes which slit the electron goes through?

In the double slit experiment, one can observe which slit the electron goes through with a flash of light as the electron is scattered by a light source behind the screen. Whenever we know which slit ...
apg's user avatar
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In the delayed-choice quantum eraser, why is a stepper motor used?

This is similar: Interference pattern in delayed choice quantum eraser However, it appears to misunderstand the notion of the detectors D3,D4 providing path information and affecting the results at D0....
AlphaCentauri's user avatar
1 vote
1 answer
70 views

What if Delayed Choice Quantum Eraser is actually predicting/affecting which way the idler photons will go?

I understand there is no FTL and retrocausality. Let's say we have detectors D1 and D2 that have already recorded the following patterns: Then we send a new photon and the signal photon lands on this ...
Merci chao's user avatar
0 votes
1 answer
36 views

Delayed quantum eraser, turning off sensor to bring back interference

I've been learning about the delayed-choice-quantum-eraser experiment. To sum up; I imagine a double slit which has behind it a crystal which splits photons into entangled pairs. The crystal sends a ...
Juel Herbranson's user avatar
-2 votes
1 answer
81 views

FTL communication setup. Why wouldn't this work?

The setup is similar to quantum eraser experiments (see below). The laser pulses at regular intervals to send bunches of photons. They get split in half as entangled particles. One beam is sent 1 ...
nocies's user avatar
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1 answer
91 views

Why should our Knowledge of an Experiment Affect it's Outcome?

The "Delayed Choice Quantum Eraser" experiment shows that our knowledge of an experiment affects it's outcome. Why is this?
Willem Esterhuyse's user avatar
2 votes
1 answer
76 views

Delayed choice quantum eraser setup with no beam splitter?

I know this question has probably been discussed many times before. But, I need a clear answer about this setup, in case there is no beam splitter. What is going to happen in this situation? My ...
Athraxin's user avatar
5 votes
2 answers
138 views

Does entanglement in a quantum physics experiment automatically cancel the interference?

Background: I'm currently doing self-study of quantum physics by following university level quantum physics lectures on YouTube (e.g. the YouTube MIT 8.04 Quantum Physics I, Spring 2013 or Stanford ...
Terminality's user avatar
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1 answer
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Symmetrical Delayed Choice Quantum Eraser

This is a modification to a Kim et al.-type quantum eraser experiment. According to the research paper which proposed this modified experiment, This modification makes the similarity to Bell-type ...
Duke William's user avatar
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4 answers
331 views

Is signal photon independent of idler photon in Delayed Choice Quantum Eraser?

--Diagram from Wikipedia of the experiment of Kim et al. (1999) Original research paper: A Delayed Choice Quantum Eraser I want to know whether the landing position of the signal photon (photon that ...
Duke William's user avatar
1 vote
3 answers
332 views

How and what mechanism does govern the failure of visible interference pattern and formation of analytical interference pattern in DCQE experiment?

Preface: This is a follow-up question to the following two questions: Does simply putting a photon-splitting crystal after a double slit break the interference pattern? Simplified delayed choice ...
Duke William's user avatar
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2 answers
129 views

Asymmetric quantum eraser: Contradiction between direct and indirect measurements?

I studied the experience of Kim et al. (1999) that specialists are familiar with : https://en.wikipedia.org/wiki/Delayed-choice_quantum_eraser https://arxiv.org/abs/quant-ph/9903047 I propose here a ...
Paul Dubois's user avatar
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1 answer
58 views

Time switched quantum detection

Two thought experiments - Modulated double slit A double slit experiment in which one slit is repeatedly opened and closed. We expect a non-interference pattern when closed and interference pattern ...
ddddmmmm's user avatar
-1 votes
1 answer
64 views

Does Double Slit Detection Rate Change when Path Is Known vs. Unknown?

Is the overall rate of particle detections you will obtain in a classic double slit experiment dependent on whether the experiment is set up to cause an interference pattern or not? Another way of ...
Peter Moore's user avatar
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1 answer
58 views

Utilizing Switching Mirrors in a Quantum Eraser to Send Binary Information Back in Time [closed]

We know that the information that reaches the detectors in a quantum eraser cannot be used to send information back in time, but I'm thinking there is still a way. When viewing the results of the ...
Tyler's user avatar
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1 vote
1 answer
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Can we know the future with quantum mechanics?

I have created a test scenario. Please see the image below. Two men working on this test, Erdal and Kervan. Erdal is in the world, but kervan is 10 light seconds far from the world. The light source ...
fobus's user avatar
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1 vote
1 answer
91 views

Does a double two-slit experiment show an interference pattern?

Here's the delayed choice quantum eraser setup from Kim et al. (1999), from Wikipedia. Don't worry, we're going to throw out almost all of it. An argon laser generates individual 351.1 nm photons ...
Martin C. Martin's user avatar
-1 votes
1 answer
48 views

Erasing distant which-way information

In a quantum eraser experiment, you have which-way information, which can destroy interference, but then choose to erase it, and get the interference back. This which-way information is often carried ...
Martin C. Martin's user avatar
1 vote
4 answers
133 views

Double slit with erasure

I have been watching Feynman's fantastic lecture on the double slit experiment with electrons: https://www.youtube.com/watch?v=kEx-gRfuhhk&t=15046s Feynman proposes to shine light on the slits to ...
nir's user avatar
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1 answer
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The Source of Interference in the Delayed Choice Quantum Eraser

I am by no means an expert, so I ask if any and all answers can be put into simple terms. Regarding the DCQE, there is seen to see both non-interference diffraction patterns (when "which-way ...
OneStrangeQuark's user avatar
1 vote
1 answer
66 views

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 ...
TommyX's user avatar
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0 answers
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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 ...
matthias_buehlmann's user avatar
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1 answer
53 views

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 ...
Cloudyman's user avatar
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2 answers
436 views

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 ...
flevinBombastus's user avatar
3 votes
3 answers
306 views

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 ...
flevinBombastus's user avatar
1 vote
0 answers
89 views

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 ...
Francesco Cannistra''s user avatar
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1 answer
89 views

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 ...
Androniq's user avatar
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1 answer
133 views

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 ...
Xfce4's user avatar
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2 votes
1 answer
286 views

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 ...
epokhe's user avatar
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1 vote
1 answer
157 views

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 ...
Hadus's user avatar
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0 votes
1 answer
104 views

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 ...
user avatar
0 votes
1 answer
73 views

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. ...
user avatar
-3 votes
1 answer
561 views

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 ...
Ong Tsu Herng's user avatar
1 vote
2 answers
206 views

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 ...
Tian's user avatar
  • 47
2 votes
1 answer
413 views

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 ...
Tian's user avatar
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1 vote
1 answer
235 views

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 ...
jwimberley's user avatar
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4 votes
2 answers
98 views

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: ...
Chantal Roth's user avatar
0 votes
1 answer
79 views

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 ...
ParityViolator's user avatar
-1 votes
2 answers
123 views

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 ...
Kyungmin Kim's user avatar
1 vote
1 answer
112 views

Why is there a π phase shift in Fig.4 compared to R01 shown in Fig.3 in DCQE?

This question is about Kim et al. 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?....
William8964's user avatar
2 votes
2 answers
3k views

Why doesn't delayed choice quantum eraser experiment imply retrocausality?

WRT: https://www.youtube.com/watch?v=0ui9ovrQuKE&ab_channel=ArvinAsh Now I found a paper "Why Delayed Choice Experiments do NOT imply Retrocausality by David Ellerman" on the internet ...
Pranav K's user avatar
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1 vote
1 answer
95 views

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 ...
QuantumDuck's user avatar
0 votes
1 answer
40 views

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 ...
Hierarchist's user avatar
2 votes
1 answer
151 views

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 ...
vovan's user avatar
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1 vote
2 answers
114 views

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 <...
ojosilva's user avatar
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2 votes
2 answers
285 views

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 ...
Anthill's user avatar
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1 vote
0 answers
81 views

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 ...
jettosutorimu's user avatar