Quantum entanglement Definition and 299 Threads

The Pauli exclusion principle: is the quantum mechanical principle that no two identical fermions (particles with half-integer spin) may occupy the same quantum state simultaneously Quantum entanglement: the type of interaction is such that each resulting member of a pair is properly...

I already asked this question on physics.stackexchange.com, but did not get the desired response. I am interested in the opinion of your community. Picture an entangled pair of spin 1/2-spin particles with total spin 0. In the diagram, particle 1 of the pair is moving to the left (-y), and...

Hello, I can understand only the basic principle behind quantum entanglement. Do you guys know of the mechanism by which it works? I understand that there is no information being transferred between particles that react under entanglement. So what then is the hypotheses as to how one particle...

How and where is quantum entanglement orchestrated? Does it require a deeper, non-spacial level of existence where the distance between entangled particles is irrelevant?

Hi Do the experts on this forum think that it is possible for there to be special particles scattered throughout the volume of a living human brain which together form a single permanent quantum entanglement which lasts at least as long as the lifetime of the brain? If yes, what do you think...

Hello everyone, I have a basic understanding of quantum entanglement. One thing I don't understand is the following: For particles to be entangled, is it necessary to produce the entanglement via whichever means, or are all particles entangled to another particle to begin with? By the latter, I...

As an amateur, I have been reading about the EPR argument, and afterwards Quantum Entanglement recently. Then I thought that the bound between two particles is only the applicability of a physical rule of everyday reality. For instance, the momentum or energy must be preserved at all times, so...

I'm trying to follow the logic to the quantum theory of the entanglement of light. I'd like to ask a question about one of several problems I'm having with the entanglement. If: Photons (Light) have orthogonal electric and magnetic waves. And: In discussions of polarization of light for...

It is said nothing can escape the Event Horizon, not even light. How about an entangled pair that is inside the event horizon and outside it. Would they still be entangled such that they still form correlations?

Two or three years ago there was an interview in a science journal with a physicist who had worked on the large hadron collider. The interviewer asked what he wanted to do next,and he replied that he'd like to do some experiments in quantum entanglement but had no funding. Apparently donations...

Article: "Faked States" mimic quantum entanglement Does anyone know where to find a copy of this that isn't pay-walled? http://physicstoday.org/resource/1/phtoad/v64/i12/p20_s1?isAuthorized=no

From my understanding of it thus far (and please pardon me if this is the result of a novice perspective of the subject): a) if a pair of particles are entangled they are known to be in the same state or exactly opposite states b) changes to the state of one of the two particles introduce...

speed of "transmission" in quantum entanglement when we "collapse the wave-function" via observing one of the entangled photons: is the transfer of the collapse information instantaneous (to the twin photon) or a few/many orders of magnitude of speed of light? lets say we observe one of the...

I am just finishing up an undergraduate course on quantum mechanics, and I plan on watching Leonard Susskind's online lectures on http://www.youtube.com/playlist?list=PLA27CEA1B8B27EB67"over winter break. Does anyone have any suggestions about a textbook that may be good to read along with the...

I'm just trying to figure out, theoretically, how this would be possible: What type of particles would cause this to be possible and how exactly would they be linked if, in a metaphorical situation, two minds were able to communicate via quantum entanglement? I just want to know the...

I am not sure if I understand quantum entanglement so I will propose a thought experiment which you can tell me if it is correct Say I entangle two quanta of matter, such that by observing one I collapse the wave function of the other immediately. Then I give one of the particles still in...

I have read and I believe that I pretty well understand quantum entanglement but the more I learn the more it sounds like it is a way of perceiving how something happens than "spooky action at a distance". By this I mean how can this be considered a destruction of locality instead of common...

[Sorry for asking so many questions by the way, but I enjoy learning ;) ] I've always been kind of confused with quantum entanglement, and what it means experimentally, but I just read something that someone posted on another website: Is this an accurate analogy to the situation with...

The title is quite explanatory of this post. It has been suggested in other posts that quantum entanglement may be used to send usable information at speeds which may be viable for interstellar distances, making viable the holograms of Star Wars. However, as I understand it, sending...

In the spontaneous parametric down-conversion process, ultraviot photons split into two, entangled photons each with exactly 1/2 the energy of the original photon. What about other processes in which massive particles split into two or more entangled particles? Obviously total energy is...

I don't know how to shorten this question. Deep breath: If particles that interact physically and become separated are entangled, then once this was proven through experimentation wouldn't local realism theory have to be false since the universe as we know it arose from a singularity? I...

Hello all! I propose to discuss the Carl Jung’s synchronicity problem in context of such phenomenon as ‘quantum entanglement’ There are several interesting papers in the NET about http://journalofcosmology.com/QuantumConsciousness103.html

Question: If two particles are entangled, and instead of "measuring" one, you were to take apply a physical force to it, would the other particle experience the same physical force. Simple minded analogy (for my purposes): If on a billiard table two ball are entangled, and you hit one with...

Hi there, I've recently read some material on QM and entanglement in particular, and even thou I managed to understand the material I felt like it didn't contain the answer to one fairly simple question... When an entangled pair is produced, conservation of energy laws cause the members of...

Hi. Firstly, I'm not a physics student but was just wanting some answers to questions from those that are, so I thought I'd try you lot. :smile: 1. Has anyone proved that quantum entanglement doesn't happen at the macro level? 2. Regarding the 2 slit experiment and how consciousness...

Does quantum entanglement allow information to travel faster than light? http://en.wikipedia.org/wiki/Faster-than-light if you scroll down to quantum mechanics.

1. What properties (that we are aware of/discovered) can be entangled? - spin, polarization etc 2. Can we entangled/disentangled additional properties (between a two photon pair) at any particular time? for example can we have both spin and polarization entangled at same time? - can we...

I try to keep my self appraised of the current news in the field. I can not say I fully understand it, and thus the questions I am about to ask. Question #1 -------------- If you have 21 entangled atoms, and one was separated for x distance and then used for data transference...

Could entanglement just be quantum coherence of the same particle( which has one of two possibles spins) and we are observing classically what is actually a quantum event? That is, what we see as two particles is really one particle acting in a quantum behavior.

I understand how entangled systems behave [Roughly], but what causes them to do so?

First post so I'll jump straight in at the deep end (for me). Excuse me if this is a daft question but this is all new to me :) In an experiment, two electrons are entangled then separated. Someone then measures the x spin of one of them and finds it to be +. The x spin of the second...

Can macro quantum entanglement make teleportation possible?? i had a Can macro quantum entanglement make teleportation possible?? i had a kind of hypothesis...that if we entangle each and every particle of a human body with other particles which are at the destination then can't we make the...

Let’s say, state A is the opposite of state B and state B is the opposite of state A. Normally if each of the state has an opposite results of themselves to an extent that the result of a mathematical method in state A can be obtain in state B and the result of a mathematical method in state B...

Can anyone explain to me how quantum teleportation can be achieved through quantum entanglement? I read a few days ago that scientists finally "teleported" light and I read up on it and it said something about quantum entanglement. A quick wiki search brings up something I really don't...

So i have used the search feature about the topic and found some information. But i couldn't really understand how measuring the properties of one electron and knowing the entangled particles properties can help communication through cosmic distances? As i see it, i can not say give a...

Hello, I'm planning to do my EE of IB Diploma on quantum physics and I have a doubt concerning quantum entanglement. I know that when you have two entangled particles say, two electrons, which spin pointing in the y-axis for example, if you measure them 45º shifted in any direction you will...

I know the properties of quantum entanglement and what it does but what i don't understand is why do particles become entangled and why are they entangled... what connects two electrons that are millions of lightyears apart from each other? Do physicians really know? Is there any explenation of...

Greetings, Are there degrees of quantum entanglement? After entangled particles interact with others particles do they continue to be entangled to some degree? Becoming less entangled the more interactions that occur? So that there is complex network of entanglements? If so, could it be...

I looked into quantum entanglement thing last days and I think I got it right. At least the basics. Just one thing. Quantum entanglement concept says that when I measure the state of one particle, it affects the entangled one's state instantly. But what does this have to do with the...

Entangled particles seem to have 'causal impact' on each other 'instantly' violating the allowed speed-limit of causal influence i.e. 'c'. When one of the entangled particles is measured it has an impact on the other instantly. These two events (i.e. 1. the measurement of the first particle and...

Quantum Entanglement allows spatially separated entangled particles to have impact on each other instantly (overcoming the allowed speed-limit of causal influence which is 'c'). How does Quantum Field Theory address this problem (protecting causality and chronology)?

So from what I understand of Quantum Entanglement: 1. Two particles are produced which are linked somehow so as to have the opposite spins 2. By measuring one particle, the entanglement is broken - however that you then also know the state of the other particle. This is said to be...

Hi all Can you help me? Can the quantum entanglement exist between fermions which never interacted each other? For example – if this states of fermions are described by Slater determinant Does exist some papers from scientific journals about this theme? Thank you in advance...

All the scientific documents explaining QE that I have read always refer to the entanglement of photons, and yet some news reports state that ions such as beryllium and magnesium have been entangled (http://www.livescience.com/strangenews/090603-maco-entanglement.html) so that instead of just...

Hi, I will like to ask this question about quantum entanglement and confirm the "weirdness", cos some info I get says entanglement aren't weird at all, while some says it does. Here's the question: If we prepare and get a bunch of entangled electrons bunch A and bunch B (A is entangled to...

I know this is probably an extremely simple question, but anyway... I shoot two particles towards each other. They collide, and then go their separate ways. Then I measure the position of particle A with full precision. This will allow me to determine with full certainty the position of...

I've searched these forums hardcore about these questions and the wide range of answers is so confusing to me, so I hope that maybe if I provide some examples and specific questions, I may better understand. I always hear that quantum particles exhibit "intrinsic" randomness in the states they...

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Greetings. I'm currently writing a novel that incorporates kernels of truth from current quantum physics theories and experiments. Please note that I am 100% layperson where this topic is concerned. I've tried to do my 'homework' by reading books geared toward folks like me... not smart...

Yesterday, my 12 year old nephew asked me a physics question after we watched a documentary about Einstein and relativity on the science channel. I know just enough about physics to be dangerous, and I can usually answer his questions but this time he had me stumped, and I couldn't find...