What is Entangled: Definition and 270 Discussions

Entangled, 2004, is an abstract sculpture created by Indiana-based artist Brose Partington (American b. 1979). The sculpture is located on the Indiana University-Purdue University Indianapolis (IUPUI) campus at the Herron School of Art and Design, 735 W. New York Street in Indianapolis, Indiana, in the United States. It was given to Herron by Ezra Freidlander and Linda H. Freidlander in 2005.

View More On Wikipedia.org
Recent contents Top users
  1. M

    Entangled particles inside a black-hole

    Would it be possible to study black-holes just by entangling particles and sending some of them right into a black-hole?
  2. craigi

    Measurement of entangled particles causes dechorence at a distance?

    If we entangle particles and separate them by a large distance, can the action of measuring one cause decoherence at the other's location? If yes then does this violate relativisitic causality? Could we not use this process to transmit information instantaneously? If no then why not? Is there...
  3. N

    Uncertainty on entangled electrons

    We know that can't measure both position and momentum simultaneously whether both are orthogonal. If i measure position one entangled electron and momentum on other electron for single state then how Heisenberg's uncertainity princple works?? so We may know the both parameter.
  4. Dadface

    Detecting Entangled Photons: Principles and Experimental Methods

    Hello all, I have been searching and trying to find out how entanglement is detected experimentally, but I have a few sticking points. Initially I just want to know the principles behind the experiments. In summary this is how I understand it so far. 1. Entangled photons produced eg in pairs...
  5. F

    Can you ever have an odd number of entangled particles?

    This should be a very easy question to answer, but oddly enough I'm not certain what that answer is. So I thought that someone here could help me. It's easy enough to visualize and understand a pair of entangled particles, and how measuring the state of one instantly effects the state of the...
  6. L

    Understanding Entangled Particles: Is it Possible?

    I am trying to understand how it may be possible to maintain two particles in an entangled superposition. Is this possible or has this already been done?
  7. J

    Preparing entangled states, how is this possible in the simpest cases?

    I'm having trouble finding comprehensible explanations of how experimenters can ever know that two particles are entangled. I understand that the first experimental confirmation of entanglement used Calcium or Mercury vapor which when excited gave off pairs of entangled photons. But how did...
  8. K

    Manipulating spin of entangled particles

    Hello all! I'm trying to wrap my head around this quantum entanglement thingy. As far as I have understood, if you have two entangled particles, say two electrones, it is impossible to predict their spins since they are thought to be in superposition of both up and down. But if you measure...
  9. S

    Do electrons (in a shell) have to be necessarily entangled?

    Are electrons in the, say lowest energy level, shell, of an atom, always entangled? i.e. Do electrons (in a shell) have to be necessarily entangled? Is there any maths (law of conservation of spin/momentum etc) that says so? Any relation with Pauli's exclusion principle?
  10. T

    How does two particles get entangled?

    I mean, which is the operational mechanism? Is it deterministic? I mean, can I "grab" two particles and make them entangled or the process is random and I can only make a lot of them and filter only the ones that get entangled? My idea is that, perhaps, by knowing how it happens in real life...
  11. T

    Quantum entanglement - what attributes are entangled?

    Hello there! I´ve tried searching the internet but seems to be in need of a heavy book for this answer. I stumbled upon this forum and decided I would love to ask some Experts here :-) Basically what attributes are quantum entangled? I know that spin is, but is fx kinetic energy? Are...
  12. R

    Possibility of million entangled photons

    Entangled photon-pairs are being produced in labs with 'Spontaneous Parametric Down Conversion' apparatus. While in the core of our sun gamma photons are being produced through nuclear fusion which then down-converted into myriad of low-energy photons. Is it possible that those myriad of...
  13. M

    Why are entangled states generic?

    Hi folks --- I was just reading that entangled states are very much the norm in the universe. Can anybody tell me why entanglement is taken to be such a pervasive feature of the world, so that product states are the exception? Has it got something to do with the fact that strictly speaking all...
  14. S

    What does position entangled mean?

    what does position entangled mean (physically)? The below is an attempt to understand position entanglement. It may require a lot of corrections and modifications. Look forward to your responses. A photon (A) would have a probability distribution, so would it's entangled twin/photon (B). The...
  15. M

    Why are interacting states necessarily entangled?

    It just occurred to me that I don't know why composites of interacting particles are always in entangled -- as opposed to mere product -- states. Obviously if they are not interacting we will just represent them as being in a product state; but why is it that being in a product state entails...
  16. S

    Forming the most general two qubit entangled state & parametrizing it.

    I have seen four two qubit entangled states of the form: $ \frac{1}{\sqrt{2}} \left | 00 \right > \pm \left | 11 \right >$ $ \frac{1}{\sqrt{2}} \left | 01 \right > \pm \left | 10 \right >$ I want to write a most general two qubit entangled state. I presume it can be of the form: $...
  17. DrChinese

    Double-slit interference pattern measurement with entangled photons

    Although it is well known that a series of individual photons will build up an interference pattern in a double slit setup, there have been few (if any) experiments where such a pattern is built up by sending photons through one at a time. Here is a great experiment from one of the top quantum...
  18. Q

    Why is Schrodinger's Cat entangled? Or is it not?

    Why is Schrodinger's Cat entangled? Or is it not? I recently saw a poster on deviantart that said this: http://browse.deviantart.com/art/WANTED-Schrodinger-s-Cat-130508078 It said it was in a superposition, that i get, but the entanglement? That i don't get. -QuantumPixel
  19. C

    Measuring the polariztion of a pair of entangled photons

    Hi, I'm quite new to quantum mechanics, learning about it in my free time in a life-long learning fashion :) I've been trying to find a solution to a problem for some time, and the results I included below appear to be OK, but I have doubts about the method I used, so any help or guidance...
  20. S

    Can particles be entangled on any property having more than two states?

    can particles be entangled on any property having more than two states? Photons can be entangled on spin. however spin has only two states: Up or down, plus or minus So the question is: is there any property (having more than two states) on which photons/electrons/bucky-ball can be...
  21. S

    Why do entangled particles have to be in an indeterminate state?

    Why do (we assume that) entangled particles (say photons/electrons) have to be in an indeterminate state?
  22. M

    What happens if you take two quantum entangled particle and

    ...sent one into a black hole?
  23. P

    Proof of Entangled Particles being Indetermined

    I'm sure this has been asked a million times, but how do we know that entangled particles don't "choose" their states when they're separated? If possible, choose the most basic example. Thanks!
  24. I

    Entangled photons in bell experiment: transfer phase or angular momentum?

    Regarding the polarization correlation studies generated using parametric down conversion. All the studies appear to be done correlating the polarization of linearly polarized photons. Has any experiment been done showing the same effect with circularly polarized light? 1) If this...
  25. D

    Entangled particles and relativity

    What happens when you take two entangled particles and put one on a spaceship that moves close to the speed of light? Now you measure one of the two particles. The state of the other should become decided at the exact moment you do the measurement. But there is no absolute simultaneity if you...
  26. T

    Could a Fermion be Entangled with a Boson ?

    Could a Fermion be Entangled with a Boson ?
  27. M

    Simultaneously Measuring Entangled Particles

    Let's say you have entangled particles emitted from a source. What happens if you measure the spin of both entangled particles simultaneously with respect to the reference frame of the source? Would the spins measured still be opposite (anti-correlated)? Would you even get a definite...
  28. LarryS

    Electrons Entangled with Nucleus?

    Consider the simplest of all possible atoms: A hydrogen atom with only a proton as its nucleus. According to QFT, the electron is constantly exchanging photons with the proton. So, are the electron and proton entangled? Thanks in advance.
  29. A

    Exploring the Possibility of Entanglement After the Big Bang

    If everything came from the same singularity prior to the Big Bang, are we still entangled? If yes could we retrieve information of the whole Universe from one single particle? If not when and how were we de-entangled?
  30. S

    What does it mean to be momentum entangled?

    what does it mean to be momentum entangled? and how can it improve resolution? what does it mean to be momentum entangled? - say for photons and how can it improve the resolution of an optical microscope? Understanding polarization entanglement is easier/familiar - i.e. - the twins have...
  31. S

    Can a photon be quantum entangled on more than one property/factor?

    can a particle/photon be quantum entangled on more than one property/factor? (at the same time-- redundant phrase(?)) for example can two photons be entangled along say - a) spin AND momentum b) position and momentum c) spin and position d) polarization and spin
  32. nomadreid

    Bra-ket notation to Matrix for entangled pairs

    I am confused about the the notation |ab> for an entangled pair. Isn't this the same as the tensor product |a> \otimes |b>? If so, I run into another confusion when using the corresponding matrices. I read that I should apply a Hadamard operator H twice to the input state |01>. Does this mean...
  33. Fightfish

    Separable state vs part of entangled state

    There is something that has been bothering me recently: that is, the distinction between a separable state and being part of an entangled state. To make my query concrete, consider: \left|\psi\right\rangle = \alpha \left|0\right\rangle + \beta \left|1\right\rangle and...
  34. S

    How are entangled particles separated/distinguished?

    Entangled particles are used in various experiments for example: DCQE (delayed choice quantum eraser) Bells tests Mach Zehnder (modified) DCES (delayed choice entanglement swapping - Ma) Now, one out of a trillion photons, on average, gets entangled after passing through the SPDC (?)...
  35. A

    Quantum Mechanics Entangled States

    Homework Statement I've been asked to find out if are entangled states or not Homework Equations I thought an entangled state was one where a measurement of one qubit revealed the nature of the other qubit in the state The Attempt at a Solution If I am correct in my definition of an...
  36. StevieTNZ

    Two Groups of Entangled Photons

    If we have two groups of photons; each group consisting of two entangled photons. We allow one of the photons from each group to interact with another object. If we perform a polarisation measurement on each photon of one group, will the photons in the other group, independent of whether...
  37. StevieTNZ

    Entangled Photons: V/H & 45/135 Polarisations

    When you create a pair of entangled photons, are they simultaneously in a superposition of V and H, and 45 and 135 polarisations?
  38. M

    Is there anyting really entangled in Quantum Entanglement ?

    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...
  39. G

    Entangled photon polarization correlation

    Hello everyone, I've got a quick question... Given two entangled photons, going through a polarization filter with relative angle a, what is the correlation between the two "answers" (whether the photon is blocked or let through)? I believe it's either cos(a) or cos^2(a), but I'm not sure...
  40. R

    Inner product with maximally entangled state

    Consider the maximum inner product of a density operator with a maximally entangled state. (So, given a density operator, we're maximizing over all maximally entangled states.) I'm pretty sure the minimum value (a lower bound on the maximum) for this is 1/n2, using the density operator 1/n2...
  41. G

    How Does the Angle Between Axes Affect Spin Correlation in Entangled Particles?

    Given two entangled particles, and the spin of both is measured along two separate axes making an angle of "a", what is the correlation between the two? So how much of the particles will give the same "answer" to the spin measurement? I've tried googling, but the answers I did find were...
  42. T

    Atomic Entanglement: Could Macro Objects Become Entangled?

    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?
  43. thenewmans

    Opposite spin of entangled photons

    Quick question: Do entangled photons have opposite spin? If so, how do we know? I mean I know that they should because of conservation of angular momentum. But Cos(0)^2 = Cos(180)^2. So it looks like they’re the same. Or am I missing something.
  44. andrewkirk

    Does wave function of an entangled particle collapse instantly?

    Dear generous and helpful physicists, A number of threads here contemplate strategies for transmitting information faster than light by observing an entangled particle in one place, allegedly causing the wave function of its entangled twin to instantly collapse in another, far away place...
  45. I

    Splitting photons are entangled?

    I'm sorry if this is a silly question and please forgive me but, if you split photons into two by any medium or matter can it entangle photons? Do the photons have to go through a beta barium borate crystal or any other crystals? Are there any alternatives to split photons? Please provide good...
  46. P

    Do entangled systems have parts?

    Some say that there are parts but their properties depend on the whole. But if we cannot assign properties to the 'parts' of an entangled system, what can it be to be a 'part' or any kind of entity in the first place? Can we say that there are parts but that they are not independent? What can...
  47. H

    How are atoms entangled and can it be done remotely?

    I'm a bit confused about quantum entanglement. First of all, how exactly do you entangle two atoms? I've heard about how they entangled atoms in quantum teleportation experiments, but I don't get how they did it. I've heard that the atoms must "interact", but what exactly does that mean? Do they...
  48. S

    Are the two wave functions from a double slit (in single particle int) entangled?

    http://en.wikipedia.org/wiki/Quantum_entanglement#cite_note-0" Is there an experiment where bucky balls are entangled? Many of us have heard about bucky balls showing single particle interference in a double slit experiment. However I have not heard of them being entangled. I read the...
  49. M

    What causes particles to become Quantum Entangled?

    Do they have to vibrate at the same frequency or something similar?
  50. S

    Remote-Sensing Quantum Hyperspace by Entangled Photon Interferometry

    http://arxiv.org/abs/1101.2223 Abstract Even though ideas of extracting future-related, or Faster-Than-Light (FTL) information from hyperspace using quantum entanglement have generally been refuted in the last ten years, in this paper we show that the original 'Delayed Choice Quantum...
Back
Top