Entanglement Definition and 882 Threads

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...

Is Energy the "Glue" of Entanglement? Forgetting the case where one particle becomes 2 particles, can entanglement between two, originally independent, particles occur without some kind of energy exchange between them? Is energy the "glue" of entanglement?

Hi, I was reading some novice stuff about quantum entanglement and I was wondering if entanglement occurs in either of these two scenarios: 1. electron and positron entangled as a result of being created by a photon passing over a heavy nucleus 2. two free electrons entangled with...

A question came up about entanglement and I've only studied very little QM so far, so I went to wikipedia to see if I could become any wiser and they had an example on photon entanglement which was quite straight forward (though the whole page lacks sources =[ ). The example shows that if you...

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?

I'm a bit confused about entanglement with regards to quantum computing. I'm not an expert by any means, but I've been reading around about quantum computing and was confused about something. I've read that, you can't directly observe a qubit, because if you do the wave function will collapse...

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...

First time poster: Is there any math out there that prohibits the following scenario from taking place: Alice and Bob are entangled. Is it possible to detect that Alice is entangled, without measuring Bob and without destroying the entanglement (or causing decoherence)? Note: I am not...

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...

Hello all, I know "quantum entanglement" is real, in some sense. I know that if we entangle two particles their spin, for instance, is closely related. Especially spin entanglement has enough evidence, yet it is also easy to explain using a hidden variable. Hence I wonder: what other...

Let me see if I understand this correctly, please critique. Say, 6 players are playing a game of hold em. This means that in a randomly shuffled deck, two cards will be dealt to each player totaling twelve cards. Say no player has observed their cards. At this point the cards are in...

Let's say you have two entangled particles. Is it possible for one of them to fall into the event horizon of a black hole and the particles still be entangled? Or say the two particles are far apart and the universe undergoes extreme expansion (just after the Big Bang, say) such that they are...

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...

Homework Statement A source emits pairs of particles "back to back", 50% into directions a1 and b1, 50 % into directions a2 and b2, where the choice between a1+b1 and a2+b2 is fundamentally undetermined. Insert Diagram A suppose that directions a1 and a2 are combined on a 50/50 beam...

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...

http://physicsworld.com/cws/article/news/31068 I thought only elctrons could be entangled but now atoms and even ions can be entangled. Would this suggest that it could work its way to the macro levels. Could two diffrent rocks or soccer balls become entangled?

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...

From what I have read so far, it seems as though entanglement can only exist between particles of the same type (2 photons, 2 electrons, etc.) - that their Hilbert spaces must be compatible and of the same dimension. Is that correct? As always, thanks in advance.

I read about Entanglement and the particles' peculiar attributes concerning instantaneous action from a distance, and I wonder if they are related to the notion of fields such as the gravitational field's attribute of inflicting action instantaneously. </Layman's question>

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...

Suppose two particles become entangled. Are they ever dis-entangled? If so, how? If not, wow. Thanks!

Hello all ! Help me please. I can not understand – which particles are entangled in this case http://prl.aps.org/abstract/PRL/v106/i11/e110404 Full text here http://arxiv.org/PS_cache/arxiv/pdf/1003/1003.0720v1.pdf

http://www.physorg.com/news/2011-08-entanglement-macroscopic-dissipation.html http://prl.aps.org/abstract/PRL/v107/i8/e080503 2.2cm cube (1 x 10E12) atoms entangled 0.5m apart for an hour now that's progress!

Entanglement – the order of measurements can be important. I try now with some formulas - hope it's reasonably understandable: First known substance - unless I am floundering in it: I imagine that the p - photons is measured first (p1) and meets a PBS (0) (x = horizontal and y = vertical)...

#1) Following the complementarity principle, a photon (plus everything) can behave *either* as a wave *or* as a particle at any instant. So if I setup a quantum erasure mechanism which switches the wave/particle behavior or path A, path B behaves similarly. If I arbitrarily consider 'wave...

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

I recently have been doing some work on the entanglement phenomenon. In this regard someone brought to my attention an experiment with amazing results but unfortunately he did not have an exact reference for the experimenter or where the results were published. Very briefly, the experimenter...

I'm confused about a premise implicit in the standard QM model of entanglement, which seems logically inconsistent. I understand that entanglement arises when two or more particles interact in some way to become synchronized in their quantum states, which also must be indeterminate in terms...

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...

Good morning Gentlemen (and Ladies), I'm looking for some help from you HV experts out there. I have had an event where it is believed that a flooded transformer connection box induced a fault on to a 33kV 3phase transmission line, and the fault current was enough for the repulsive forces...

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...

In the delayed choice quantum eraser (DCQE), such as the walborn paper, link below: http://arxiv.org/PS_cache/quant-ph/pdf/0106/0106078v1.pdf" we try to find out the polarization/path via quarter wave plates (see diagram on page 7 of the paper) Now does not entanglement break (i.e...

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...

Why scientists think that quantum entanglement works at the distance? Let's say we have two particles, one spins around axis by x another by -x, we make a measure and find that particle a spins by x, then particle b should spin by -x. How come such non logical interpretation could be made that...

Just as a general survey, who agrees with the theory of Entanglement (where everything is connected & is one)?? Also who agrees that everything is just energy? Like when you go down past the atomic scale and Planck scale you reach just pure energy. If you could explain why or why not you agree...

I'm a physicist, but I'm not a specialist in the foundations of quantum mechanics. This month's Scientific American has an article by Vlatko Vedral about entanglement and decoherence. Paywalled article, with a brief summary...

understanding 1. single photon and 2. entanglement ...states a photon spin is not know till we measure it. once we measure it we get some value (L or R, V or H etc)? does this value change if we were to measure it again after a few seconds? (assuming no interaction in-between)? now we move...

do we have any proof of entanglement other than Bells Inequalities?bell's inequalities says that: - no physical theory of local hidden variables can reproduce all of the predictions of quantum mechanics or in other words - the correlations in/during Quantum Entanglement (QE) are stronger...

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.

Is entanglement effected by space-time? other than, of course, when entanglement is created/destroyed...Some related thoughts: - information transfer needs mass-energy to carry it - mass-energy cannot travel faster than speed of light - in entanglement...mass-energy is not involved...(in the...

Faster than light (FTL) is not possible via entanglement because you need to compare both the photons... or in other words entanglement is a single system that is "spread out" (across time-space) , the two photon pair behaves as a single system in which the two photons are within that system...

I just found a paper which was thinking along similar lines: http://casimirinstitute.net/coherence/Jensen.pdf Any comments on why FTL is not possible (after browsing the paper)?

Does FTL transmission of information (via 1 entanglement or 2 any means) violate causality? FTL = faster than light1. I argue that FTL (of information) does NOT violate causality or relativity. 2. Also FTL (of massless information) is possible via quantum entanglement. All you need is a DCQE...