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,
127
questions
0
votes
1
answer
28
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 ...
-2
votes
1
answer
74
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 ...
- 13
0
votes
1
answer
74
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?
2
votes
1
answer
70
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 ...
- 21
4
votes
2
answers
94
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 ...
- 173
0
votes
1
answer
52
views
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 ...
- 573
0
votes
4
answers
273
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 ...
- 573
1
vote
3
answers
293
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 ...
- 573
0
votes
2
answers
80
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 ...
- 11
0
votes
1
answer
57
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 ...
0
votes
0
answers
15
views
Quantum erasure experiment using electron spin?
A quantum erasure experimental setup using photon and polarizing beam splitters is demonstrated in:
(https://www.youtube.com/watch?v=2PJbAeBERjI)
My question is whether this original setup using ...
- 565
-1
votes
1
answer
59
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 ...
- 395
0
votes
1
answer
51
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 ...
- 101
1
vote
1
answer
91
views
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 ...
- 111
1
vote
1
answer
71
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 ...
- 224
-1
votes
1
answer
38
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 ...
- 224
1
vote
2
answers
87
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 ...
- 666
0
votes
1
answer
34
views
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 ...
1
vote
1
answer
61
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 ...
- 23
1
vote
0
answers
35
views
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 ...
0
votes
1
answer
47
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 ...
- 1,115
0
votes
2
answers
324
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 ...
- 1,514
3
votes
2
answers
260
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 ...
- 1,514
1
vote
0
answers
81
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 ...
0
votes
1
answer
81
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 ...
- 3
0
votes
1
answer
112
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 ...
- 710
1
vote
1
answer
207
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 ...
- 113
1
vote
1
answer
150
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 ...
- 48
0
votes
0
answers
25
views
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 ...
- 331
0
votes
1
answer
79
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 ...
user232620
0
votes
1
answer
68
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.
...
user232620
-3
votes
1
answer
384
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 ...
1
vote
2
answers
148
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 ...
- 47
2
votes
1
answer
352
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 ...
- 47
1
vote
1
answer
167
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 ...
- 3,721
4
votes
2
answers
92
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: ...
- 81
0
votes
1
answer
74
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 ...
- 391
-1
votes
2
answers
113
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 ...
- 31
1
vote
1
answer
102
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?....
- 11
2
votes
2
answers
2k
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 ...
- 540
1
vote
1
answer
92
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 ...
- 11
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 ...
- 156
1
vote
1
answer
125
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 ...
- 113
1
vote
2
answers
102
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 <...
- 151
1
vote
1
answer
240
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 ...
- 122
1
vote
0
answers
72
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
...
- 351
-1
votes
1
answer
103
views
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. ...
- 9
4
votes
3
answers
286
views
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, ...
- 151
0
votes
1
answer
95
views
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 ...
- 21
1
vote
1
answer
50
views
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 ...
- 175