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,
Questions tagged [quantum-eraser]
140 questions
16
votes
3 answers
What does the quantum eraser experiment tells us?
I am a beginner in this quantum-mechanics stuff. I understand the quantum eraser only from an experimental view. So I didn't understand the formalism that describes the quantum eraser. But what does the experiment tells us? Does the photon know that…
kame
- 949
12
votes
3 answers
DIY Quantum Eraser Experiment by the Scientific American: Is this really quantum?
Click here for the publication.
Having performed this experiment, I have gotten clean results. Essentially, a double slit is made by putting a photon beam in the way of a wire with orthogonal polarizers on either side. This destroys the expected…
user36902
- 123
11
votes
4 answers
Variation of delayed choice quantum eraser
Let me base the discussion on the pictorial description of the delayed choice quantum eraser experiment on wikipedia.
First suppose that we do precisely the same thing with the lower parts of the blue and red beams as we do with the upper parts,…
Łukasz Grabowski
- 232
10
votes
4 answers
Is my understanding of the delayed choice quantum eraser correct?
I'll say in advance that I am by no means an expert on Quantum Mechanics. I understand the basic mathematics of it (Wave function and Schrodinger equation) but did not go deeply into it or study it in a complete way.
I am intrigued by the lessons QM…
fiftyeight
- 1,075
6
votes
1 answer
Understanding the quantum eraser from a quantum information stand point
Is there a way to understand the quantum eraser experiment in terms of quantum information? In particular, is there a quantum circuit that would function as a quantum eraser experiment?
The issue I'm having is that the erasure (and the detection for…
Christopher King
- 2,131
6
votes
3 answers
Delayed Choice Quantum Eraser: Am I missing something here?
Hello everyone,
I actually have three questions:
Am I missing an important detail in my understanding of how the delayed choice quantum eraser experiment is done?
How does one account for what takes place in the experiment without using the…
SpaceKidd_N7
- 57
5
votes
2 answers
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 Quantum Lectures by Leonhard Susskind, plus…
Terminality
- 183
- 5
5
votes
1 answer
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 gleaned from the D0 detector in order to enable…
Connor McCormick
- 153
5
votes
2 answers
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 mirrors, nothing. The other twin is lost.
Would this…
K. Kirilov
- 629
4
votes
2 answers
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
- 101
4
votes
3 answers
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, but I was wondering if there was a way to put…
ojosilva
- 151
4
votes
3 answers
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 photons experience no time. Since time slows down when…
Cristi B
- 395
4
votes
2 answers
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/Delayed-choice_quantum_eraser).
According the paper,…
fishinear
- 895
- 5
- 15
4
votes
1 answer
Peaks and Troughs during delayed-choice quantum eraser cancel?
This above diagram is the delayed-choice quantum eraser. My current understanding is as follows:
1) If the experiment is done with $BS_a$ and $BS_b$ both mirrors, then double-clumping is seen on $D_0$.
2) If the experiment is done with $BS_a$ and…
4
votes
1 answer
Delayed Choice Quantum Eraser modification
Based on the recent videos and articles about quantum delayed eraser experiment (https://en.wikipedia.org/wiki/Delayed_choice_quantum_eraser), I was thinking about modification of this experiment and wondering what it would result in (or if it is…
user43187