Questions tagged [quantum-eraser]

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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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Could a form of (temporally-limited non-superdeterministic) strong determinism resolve retrocausality in quantum theories?

It looks like "superdeterminism" is considered as a potential way to resolve EPR paradox/Bell's theorem/quantum theory. It seems "retrocausality" (or what could be or is called ...
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51 views

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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30 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 ...
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1answer
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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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5answers
1k views

Delayed Choice Quantum Eraser without retrocausality?

After reviewing the more than half dozen questions on the DCQE here, this doesn't seem to have been asked or answered directly - if I've missed this piece in one of the other questions or answers ...
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3answers
88 views

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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1answer
32 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 ...
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21 views

Some clarification on Kim et al.'s “Delayed Choice Quantum Eraser”

First, what is the optical delay in the experiment.In the arxiv paper published in 1999 it states it is roughly a 2.5 meter difference between the path to D0 from the BBO and the path to D1-4 from the ...
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68 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 <...
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40 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 ...
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41 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 ...
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496 views

Does the quantum eraser double slit experiment disprove many worlds interpretation?

The quantum eraser double slit experiment shows that interference pattern is destroyed not by interacting with the quantum particle, but rather by getting which path information. In this experiment ...
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In Scully Duhl quantum eraser experiment, how is it ensured that only one atom is excited?

The Scully Duhl quantum eraser experiment uses lasers to excite one of the two atoms (which each releases two photons in opposite directions) where each atom acts as a proxy for a slit in the ...
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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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1answer
42 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, ...
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118 views

Is it true that a quantum eraser can work without any observation?

It is stated in this poster from a 2007 Sciam article (link below) that an observation is not required in a quantum eraser experiment: "The fringes do not appear if the particles interact with ...
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1answer
63 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 ...
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27 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 ...
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Can delayed choice be resolved by special relativity?

I learned about the delayed choice phenomena a while ago, it was an experiment with double slit with a beam splitter behind so the entangled photon pair after the split goes to a screen and two photon ...
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1answer
36 views

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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1answer
363 views

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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3answers
249 views

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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28 views

what we call “erase” in the delayed choice quantum eraser experiment?

im thinking about the quantum eraser experiment and I got some insight that I want to check. Suppose that I have the system of the experiment (S): a closed box with 2 slits, with a 1 bit detector (D)...
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1answer
132 views

Can scatter interference patterns from entangled pairs carry information?

I am having problems wrap around why you can't send information faster than light with a similar setup to the quantum eraser experiment. ( https://arxiv.org/abs/quant-ph/9903047v1 ) What I mean is, ...
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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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22 views

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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1answer
158 views

In the quantum eraser, what if photon lands on the screen before we decide whether to turn on the eraser?

I understood that, after the photon passes through the double slit, and before it lands on the screen, if the Quantum eraser is activated, there will appear the interference pattern due to the loss of ...
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2answers
109 views

State vector after quantum eraser

Suppose I have a particle in a two-slit setup. At the slits, it's in state $|\psi\rangle = |x_1\rangle + |x_2\rangle$ I entangle it with some detector: $|\psi'\rangle = |x_1\rangle|d_1\rangle + |...
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113 views

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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1answer
42 views

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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1answer
134 views

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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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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78 views

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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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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63 views

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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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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159 views

What is the effect of Knowledge in the quantum eraser experiment?

OK, here's a question from a non-physicist about the quantum eraser experiment. If my understanding is correct, photons and their entangled counterparts become a particle and create a non-...
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Simple Quantum Eraser

I am familiar with the standard Quantum Eraser experiment. I was thinking of the following. My hunch is that the screen will show an interference pattern since the which way information for the ...
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97 views

Delayed Choice Quantum Eraser with one additional detector at the slits?

Please take a look at this experiment https://en.wikipedia.org/wiki/Delayed-choice_quantum_eraser#The_experiment_of_Kim_et_al._(1999) . You can also look at this youtube video https://www.youtube.com/...
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201 views

Can post-selecting on the screen in the Delayed Choice Quantum Eraser experiment be used to predict the quantum-eraser measurement results?

I'm curious about QM and spent the last 3 days thinking about Delayed Choice Quantum Eraser (DCQE) experiment, but I couldn't solve this issue: Assume we do the DCQE experiment so that for the whole ...
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1answer
69 views

Quantum eraser without the quantum eraser

I've recently watched PBS SpaceTime's video about the quantum eraser. In it, Matt describes a kind of crystal that splits particles into pairs and entangles them. The entangled particles are then ...
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1answer
369 views

Interference pattern in delayed choice quantum eraser

My question is why in the delayed choice quantum eraser experiment we don't see interference pattern at D0? While it looks like it is similar to the normal double slit experiments. The following ...
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163 views

Delayed choice experiment and weak measurements

My questions relate to this recent delayed choice experiment with a helium atom: http://www.nature.com/nphys/journal/vaop/ncurrent/abs/nphys3343.html Is there anyway whatsoever - directly or ...
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Is it possible to reconduct “The delayed quantum eraser experiment” in home?

The delayed quantum eraser was conducted by Kim et al. in 1999 with the use of BBO crystals, polarizers, detectors and so on. I believe some of these equipments can be found online kinda cheaply, ...
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3answers
649 views

A very delayed quantum eraser

I am a non physicist so please bear with me here. I am just trying to see if my understanding of the implications of the delayed quantum eraser experiment is even remotely accurate. If the apparatus ...
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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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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 $D_0$...