Questions tagged [quantum-eraser]

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Envelop Experiment question

The following is an extended version of the Delayed Choice Quantum Eraser called "The Envelope Experiment." This may be referred to as the "sealed envelop" or "very delayed quantum eraser." See ...
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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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1answer
83 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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68 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
41 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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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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2answers
136 views

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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1answer
33 views

In a delayed choice quantum eraser experiment, is it possible that signal photons make patterns according to idler photons being detected next year?

https://en.m.wikipedia.org/wiki/Delayed-choice_quantum_eraser#The_experiment_of_Kim_et_al._(1999) From Wikipedia: If the idler light paths were greatly extended so that a year goes by before a photon ...
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1answer
119 views

Why are my interference patterns completely out of phase?

DIY physics enthusiast here doing a double slit eraser experiment at home with a laser pointer, double slit diaphragm, and few linear polarizers (horizontal at one slit, vertical at the other, +/-45 ...
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1answer
80 views

Delayed choice quantum eraser without randomization?

My understanding of delayed choice quantum eraser experiments roughly corresponds to the Wikipedia article about them, so please forgive if this question is stupid. In all delayed choice experiments ...
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2answers
113 views

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 ...
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1answer
49 views

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 $D_0$...
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In the Quantum eraser experiment, Why doesn't detector D1 or D2 cause wave function collapse?

I thought measurement at detectors is what collapes the wave function. So why aren't these detectors causing collapse? Why is there an interference pattern?
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1answer
47 views

Question about the shift of patterns in the Delayed Choice Quantum Eraser

In the double-slit Delayed Choice Quantum Eraser experiment by Scully with the installation in the figure below, as in Wikipedia, when a photon hits D4 or D3 the intricated photon hits D0 with a ...
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1answer
83 views

Question about delayed choice quantum eraser

I'm using figure 2 of wikipedia's entry https://en.wikipedia.org/wiki/Delayed-choice_quantum_eraser If the idler beam is undetected, we get a interference pattern. If it's detected, there's no ...
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2answers
140 views

Why do we need the quantum eraser experiment? [closed]

I have read many articles about the quantum eraser experiment and I am still trying to figure out why we need it. In this sketch I show the experiment with and without the second beam splitter. What ...
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2answers
82 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
45 views

When does the exchange of energy take place in the Quantum Eraser experiment?

I found this PBS video regarding the delayed choice / quantum eraser experiment, which, like all the others I've seen, states that the interference pattern generated by the photons that pass through a ...
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1answer
98 views

Double slit and Quantum 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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1answer
54 views

In the quantum eraser experiment, is it necessary to have two which-path-erasing detectors rather than one?

In the quantum eraser experiment, why is it necessary to have both D1 and D2? Why not do away with D2 altogether and, as with the standard Mach–Zehnder interferometer, make the photons from BSA and ...
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2answers
249 views

Shor's algorithm with adversary - can (delayed) erasure of value qubits cripple calculations?

Let's look at quantum subroutine of Shor's algorithm: Hadamard gates create superposition of all (exponential number) values for input qubits. Then we perform a classical function on them, which is ...
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1answer
395 views

Taming the delayed choice quantum eraser experiment

In the paper Taming the Delayed Choice Quantum Eraser, Figure 2 shows a plot of the bits of Equation 4.7. How do they obtained these plots? For each of them, what is the corresponding function ...
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2answers
253 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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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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1answer
135 views

Idea for the Double Slit Experiment/Quantum Eraser

I wanted to ask about an idea I got about the Double Slit Experiment. As you may know, you can use the Double Slit Experiment to have particles form an interference pattern with themselves, however, ...
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115 views

Why a 45° polarizer brings back the interference pattern in the quantum eraser experiment?

I'm not a physicist, I'm just a physic-enthusiast.I have a practical sense of experiments and results but i cannot deal with the actual calculation involved. I was reading about the quantum eraser ...
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1answer
70 views

What would happen if the delayed choice quantum eraser experiment was both observed and unobserved?

What I was wondering is if this experiment was conducted, but two people chose the results. The two people would be completely isolated with no knowledge of eachother, and would each choose to observe ...
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1answer
42 views

Possible addition to the Quantum Eraser experiment

In the Quantum Eraser experiment, I understand that the particles are arriving at the screen before they arrive at the detectors or information eraser. What would happen if we could increase this ...
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2answers
162 views

In the delayed choice quantum eraser, what would happen if we were to send the second entangled particle into a blackhole?

In the delayed choice quantum eraser experiment, what would happen if we were to send the second entangled particle into a blackhole instead of the eraser apparatus?
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48 views

What happens if you put the BBO before the slits in a delayed choice quantum eraser experiment?

I've read that you can't detect an interference pattern at D0 in the image below without correlating with data from D1, D2, D3, and D4 due to the coherence being broken by the BBO crystal. Does this ...
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1answer
308 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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1answer
358 views

Quantum eraser and coincidence counter

My understanding that In quantum eraser experiment we can interpret the past only when we got the data from the coincidence counter. My question is why we need coincidence counter? Is this becuase the ...
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4answers
865 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
555 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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1answer
301 views

Double slit experiment with 'interaction free measurement' to read out the 'which route' information

We know that in the double slit experiment, the reading out of the 'which route' information will destroy the interference pattern. But the reading out of the 'which route' information can be ...
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1answer
325 views

Does the implications of double slit experiment contradict the “law of conservation of information”? [duplicate]

Not sure if I framed below question properly, let me know if anything you want me to clarify in the comments. Implications of double slit experiment show concious observation affect the 'reality as ...
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1answer
56 views

One simple question regarding delayed choice quantum eraser

My question is similar to Questions About The Delayed Choice Quantum Eraser Experiment. You may read this question and related answers first (or not). My question is, in the delayed eraser setup, if ...
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1answer
356 views

Delayed Choice Quantum Eraser? [closed]

Note that I'm looking for a layman explanations for these layman ideas. Introduction Can someone help me understand why my idea wouldn't work? Explain the the Delayed Choice Quantum Eraser? ...
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1answer
428 views

Quantum Eraser Experiment says nothing?

So, we start with a standard double slit experiment interference pattern. Then we add a QWP to determine which way information. But here is where my first problem arises. Aren't we just ignoring ...
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3answers
470 views

What does the quantum eraser experiment say about reality? [closed]

I'm not looking for the generic "which way information destroys wave coherence" or "information travels back in time" answers. I'm not saying those concepts might not be in a very broad sense true, ...
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1answer
396 views

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 ...
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1answer
100 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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1answer
98 views

Does the Delayed Choice Quantum Eraser require the signal and idler photons to be entangled?

In everything I've read about the Delayed Choice Quantum Eraser Experiment, the descriptions talk about the BBO crystal splitting of the photon into two entangled parts. The signal photon of the pair ...
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2answers
418 views

Why does the interference patterns in delayed choice quantum eraser cancel out? Why/how does it have a phase shift?

Talking about this experiment https://en.wikipedia.org/wiki/Delayed_choice_quantum_eraser#The_experiment_of_Kim_et_al._.282000.29 I am assuming that anyone able to answer my question is already ...
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1answer
260 views

Understanding the delayed choice quantum eraser from a quantum information stand point

A continuation of Understanding the quantum eraser from a quantum information stand point What quantum circuit would correspond to delayed choice? In particular, the decision of whether to not to ...
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1answer
418 views

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 ...
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2answers
153 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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2answers
405 views

Why doesn't the quantum eraser violate the no-deletion theorem?

In the quantum eraser experiment and its variants, you basically have a double slit experiment, where you detect which slit the photon went through, but then forget this information. My question is, ...
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1answer
86 views

Quantum eraser experiment with unbalanced interfereometers

In quantum eraser experiments, which path information is made available and then destroyed before the photon hits the screen. Now, say we had an experiment in which a photon is sent to a double slit ...
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1k views

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 ...