Quantum entanglement Definition and 299 Threads

This delayed choice quantum eraser experiment captured my attention and after deep thought about it, I find it really startling and totally punishing to my common sense. My question is: Can you predict the future, say, a human's mind, using the quantum eraser? I imagine a modified version of the...

If a quantum communication device based in interlakced particles equipped with powerful telescope and radio receiver is placed far away some millions is years light. Then the images and radio signals detected, could belong to the future or past. And this info from the future or past can be...

Please forgive any ignorance in advance, I have a lot of general science knowledge but know little about physics. I'm not sure if two particles with mass can be entangled, but if they can what happens if you entangle two particles while only one is accelerated, do they both gain mass, or only...

I have two photons that are entangled and exist in all possible states simultaneously. By measuring photon A, I cause the superposition to collapse, and i can see that it has a certain spin (say left). This measurement also causes photon B's superposition to collapse, but will it be spinning...

Suppose we fire two entangled particles in a tour round-flight around the galaxy and measure their spins using two Stern-Gerlach devices after returning back to the earth. Will the correlation between their spin measurement still obey quantum correlation? According to General Relativity...

I recently stumbled across quantum entanglement and thought of an experiment. I know that the laws of physics forbid FTL communication, can anyone tell me what's wrong in my following experiment? Information, in classical bits, consists of two states, 1 and 0. To my shallow knowledge, when an...

An article by the University of Waterloo talks about Quantum Entanglement Harvesting and possible novel applications, such as using it to probe the structure of spacetime: https://uwaterloo.ca/institute-for-quantum-computing/news/entanglement-harvesting-vacuum So I understand that Spacetime...

Astronomers often use the speed of a QRB or other phenomena to put a maximum bound on the size of the generating object. I find the most recent of many examples in "Furiously Fast and Red: Sub-second Optical Flaring in V404 Cyg during the 2015 Outburst Peak", Gandhi et al 14 Mar 2016...

jfizzix submitted a new PF Insights post Steering: How the EPR-Paradox Fits Between Entanglement and Nonlocality Continue reading the Original PF Insights Post.

Dear PF Forum, I have a question regarding Quantum Entanglement. I don't know much about QE, but there's something that I want to know. Two particles are entangled. Blue line is the world line of Particle A See Pic 02 Particle B travels according to Green line. And at E1 Particle B's spin is...

So I was wandering why it is not possible to use quantum particles to communicate across vast distances. As I understand it we cannot send information using this as it would break the laws of physics but what I was wandering is why can't we us entangled particles in a binary why by changing the...

Somebody told me that the condition that must be met for Quantum Entanglement in a system, is that the sum of the wavefunctions of the individual particles must equal the overall wavefunction of the system. But isn't this the case anyways with any system of two particles whether they are...

If a photon A is entangled with photon B and one somehow destroys photon A, what will happen to photon B? Will it also get destroyed? And can two entangled photons combine into one?

Are we able to observe other particles without the use of photons? Are we able to harness electrons or positrons to do this? I ask because of quantum entanglement. Creating a use out of quantum entanglement seems to rely on observing one of the particles and thus either getting its spin or...

I have a question with regards to quantum entanglement, and how it relates to the concepts of realism and locality. I am just an interested amateur who has self-studied QM in my free time, so perhaps I should first run my understanding by you first, to make sure it is accurate : the basic idea...

I saw many of you saying in their posts that non-linear crystals like barium borate are the only means of producing entangled photons. And because they are expensive, only some of you can afford them. But I browsed the international science magazines and found this...

So I came across this paper claiming that quantum entanglement was an as yet not understood Einstein Rosen-Bridge: http://arxiv.org/pdf/1306.0533v2.pdf I have two questions pertaining to this: 1. Does the math on this paper actually check out and is this possible? 2. Since this paper...

Hi, guys, I am an undergraduate pursuing electronics and communication in her 3rd year. For last few months, I have been trying to obtain internships in the field of quantum information so that I could have more exposure to it. I am already pursuing the subject learning it in bits by bits and...

Hello, searching for information about debunking quantum mysticism I stumbled upon this article: http://www.csicop.org/si/show/quantum_quackery/ , where one of the main arguments seems to be based on quantum fluctuation to explain Einstein´s famous "spooky effect on a distance". You can check...

Could any of the experts here say whether there could be a clue here as to how to resolve the apparent paradoxes of quantum entanglement? I mean if a distance is reduced to zero, in a photon' s frame, then we should not be surprised that measurements made on one of a pair should be reflected...

I've been having issues understanding quantum entanglement and non-locality recently, and certain explanations that I have been told has just made the matter more confusing. The first portion of this thread will be explaining what I know and the second part will contain the questions. First...

I've tried to find a relevant thread to post this in, but all seem to be way above my knowledge level and / or are very old. Perhaps this is not even the correct forum because my question assumes there is entanglement and we've also found a way to utilize it.. Anyway, I just read this article...

Hello everyone. Today I was pondering quantum mechanical phenomenon, and I was focusing on quantum entanglement specifically. I came up with an interesting theory - and while it has no mathematical proof or possible way of experimenting with it - I still want to hear what you guys have to say...

Hi, I have some questions concerning entanglement. 1. If it's possible (theoretically) to simultaneously measure both entangled particles. Then what will the measurements give? 2. The wave function is supposed to hold the info about both entangled particles...it's a superposition. When you...

I have been recently introduced to QM and I am deeply interested in it. I have come to know that quantum cryptography, quantum computing, and quantum optics are the hot areas where research is going on. But I'm curious, is there theoretical research going on for understanding of the quantum...

Hi This is my first post and I have come here as I cannot find an answer anywhere else. So, my physics knowledge is limited to what I learned in High School, supplemented with the odd bit of further reading via books and the internet. However, many of the concepts I learned about I find...

What I understood from Quantum Entanglement (QE), is that measuring the spin of one of two entangled particles in one location gives the spin of the other particle in other location no matter how far is the later. What I can also understand is that the same concept is applicable in the classical...

When two photons' spins are entangled, measuring one spin gives you the spin of the other. My question is, after one of the particles is measured, does it still retain its entanglement? Could you keep measuring photon A's spin to get photon B's spin?

i have a doubt, can quantum entanglement be our future source of sending signals to space without waiting a lot of light years to reach? please someone explain how quantum entanglement works in space and particles.

I am not a physicist but felt compelled to create an account to pose a question/idea. Don't beat me up over this please... I was reading on Quantum Entanglement and how entangled particles seem to pass information between them at "faster than light" speeds. Now, given that entanglement is an...

Suppose I have an apparatus A that is entangled with apparatus B. In my reference frame, I observe apparatus A, which simultaneously causes apparatus B to do its thing. However, because there exists a reference frame where apparatus B does its thing before apparatus A, it follows that there...

jfizzix submitted a new PF Insights post Measuring Quantum Entanglement? Continue reading the Original PF Insights Post.

This is a physics question but since it is on a 'universal' scale, I will ask it here. Quantum entanglement. I was watching a panel discussion with Leonard Suskind and others leading theoretical physicists...also watched a Nova program presented by David Green, etc. In both there was a...

enangle 2 electrons. Capture 1 electron by using this method http://news.discovery.com/tech/photo-first-lights-captured-as-both-particle-and-wave-150302.htm. Send an electron from Earth to the moon. Have an detector on the moon that measure a property of entanglement and same with on earth...

Can two entangled particles communicate or tell the other particle which quantum state it sould go in if one particle is in a black hole and if so can they communicate if both are inside a black hole?

For a system consisting of multiple components, say, a spin chain consisting ofN≥3spins, people sometimes use the so-called geometric measure of entanglement. It is related to the inner product between the wave function and a simple tensor product wave function. But it seems that none used this...

Can quantum tunneling or entanglement can be used for achieving faster than light , If so then How?

A friend of mine, which is not a physicist , told me in a physics class that the moviment could be an illusion, and only time could be real, due to the 'quantum entanglement' experiment, do you guys know what did he mean by that?

So I understand that as the number of entangled particles increases, observable quantum mechanical properties decrease to the extent that the mass of particles collectively loses its wave-particle character and behaves classically. In other words, the particles' collective position-space...

The below is very amateurish, so please correct/modify where needed. Just curious to know the technicalities i.e. how experiments, involving entanglement, are conducted - from a technical perspective For example - Let's take the Bell's tests Entangled pairs would/could be created via SPCD...

Hello, It's my understanding that the US can control Quantum Entanglement up to a distance of 89 miles. Can this be shielded against, like EMF can be shielded against; and what materials are necessary? Thanks, John

Hey I'm curious if it would be possible to measure if a particle's spin is in a superstate similar to how the double slit experiment can show whether or not an electron's location is in a superstate. Wouldn't such a machine allow for FTL communications, since if we measure one of two entangled...

In my thought experiment (it seems that others have asked a similar question, but I have a more specific question in my list below), we have a physicist outside the event horizon of a black hole. He has many entangled particles and sends some into the black hole. Is / Could there be some...

I have a quick question about what is going on with the following scenario: There are three planets: A, B, and C. They are arranged in the following manner: A is 4 light years away from B and 2 light years from C; the distance between B and C is 3 light years. Now suppose that there are two...

http://www.bbc.co.uk/programmes/b04v85cj I searched in this forum and no one has mentioned this. What are the thoughts of general physicists regarding Al-khalili presentation how the robin bird eyes use quantum entanglement? Searching at the net producing the following...

When a particle decoheres, or its component states get entangled with the ``environment``, surely this is not a final eigenstate. The particle is interacting ( becoming entangled etc) with other particles and systems constantly. Therefore, isn't decoherence a continuous process?

I am trying to read some of the experiments on entanglement. Is the pair of photons or electrons created by a laser hitting crystal? If this is so, then a pair of particles emerges? If this is also so, what is the big deal where the measurement occurs? The particles are created together at...

Hi, I have some general questions on Quantum Entanglement? 1. Is there a maximum distance between the two objects before it does not work? 2. Has it actually been proven/tested? If so can anybody provide some further information on this? Thanks, Ward

I have read that one particle's state responds to the partner's measured state, and this can occur billions of miles away. Since we can not conduct the experiment "billions of miles away", how have physicists come to the conclusion about the apparent limitless distance for this action? What...

I have been thinking about this recently. Say two quantum particles, or two clusters of quantum particles, exist in the same universe. 1 is on, for lack of a better term, one side of the universe, one on the other. They are entangled. Because of the distance between them, one is in the...