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.

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  1. F

    I Space and time dependence of entangled particles

    It seems that the entanglement of two particles does not change with time and can cross long distanced as long an neither particle decoheres with the environment. This makes me wonder if the wave function for that entanglement can have any time or space dependence? I only did a brief search for...
  2. Hououin Kyouma

    B How can you ensure that the particle has already been entangled?

    There are several questions I am wondering. 1. If I give you a particle, how can you ensure that the particle has already been entangled? 2. If I give you a pair of particles, how can you ensure that these particles have already been entangled? In how many ways, e.g. in the...
  3. DrChinese

    A Novel entangled photon source with heralding

    Just saw this article from a highly respected research team, and thought some might enjoy seeing how the state of the art continues to develop rapidly: 12-photon entanglement and scalable scattershot boson sampling with optimal entangled-photon pairs from parametric down-conversion Han-Sen...
  4. C

    I Entangled Photons in Opposite-Configured Mach–Zehnder Interferometers

    So, I have a pretty basic (for this forum, not for me) question: how will two entangled photons behave in the opposite-configured Mach–Zehnder interferometer systems? One of the photon goes through the closed system while the other goes through the open one. Do they simply lose their...
  5. Quarky nerd

    B Entangled electrons in the Stern-Gerlach experiment?

    I have always been interested in entagled electrons. so I thought about the stern gerlack experiment and simly wondered what would happen to entagled electrons in such an experiment. (although the prefix says high school i am able to appreciate more complicated answers).
  6. F

    I Decorrelate 2 particles initially entangled

    Hello, I am studying the entanglement in quantum physics, especially the Aspect's experience where 2 photons initially correlated keep this correlation through the measure of their polarity. The Wikipedia article is only available in French, but there is an article in English written by Alain...
  7. Laith1

    B Is the electron of Phosphorus entangled with its nucleus?

    Need a quick answer!
  8. zonde

    I How to think about partially entangled states

    I am trying to understand how to think about a state of the form: |\psi \rangle=\alpha|H_A H_B\rangle+\beta|V_A V_B\rangle where |\alpha|\neq |\beta| It is between pure entangled state and a classical state like \psi \rangle=|H_A H_B\rangle, but it is not mixture of the two either. So it seems...
  9. entropy1

    I Do macro objects get entangled?

    If we consider the Unitary evolution of the wavefunction, and interpret measurements as becoming in superposition, taking it that the measurement device gets in a superposition of spin up and spin down, do two measurement devices that each measure one particle of an entangled pair become...
  10. K

    B Why 50% of entangled photons pass through the polarizer?

    Hi. If we have 1 million entangled photons separated from their "entangled partner". We send all those photons (without their "entangled partners") through a polarizer. Each photon has has 50% chance of passing through the polarizer. So 50% of the photons will pass through the polarizer and...
  11. K

    B Exactly why FTLC is impossible with entangled photons?

    It’s written almost all physics books and courses that entangled photons can’t be used for faster than light communication. The question about used entangled photons to communicate faster than light has been discussed before, but I didn’t get exactly why faster than light communication with...
  12. I

    I Entanglement: which properties are entangled?

    Hi, So far I understand that when two particles are entangled measuring the state will provide the same result for both particles. But what I can't figure out: a particle has multiple properties like spin and momentum etc, are all these properties the same (or opposite), or only the one...
  13. Allen_Wolf

    B Does Observing an Entangled Particle Affect Its Superposition?

    Consider two virtual entangled particles (+ve & -ve particles) which emerged out of nothing. We keep +ve and -ve in two different boxes. If the box containing +ve particle is closed and we do not observe the particle, then it is said to be in a superposition of +ve and -ve, Right? After some...
  14. X

    B Measuring entangled particles along several angles

    Heya, I was wondering what happens when you measure the spin of particles along several different angles on an entangled pair. As far as I understand Bell's theorem, it basically says that if you first measure particle A in some angle, and then measure a particle B at some some angle, you'll...
  15. .Scott

    I Entangled Clocks: Exploring Possibilities

    I just overheard an engineer saying "There are no two clocks in the world that tell identical time". She was describing a time syncing mechanism to another engineer, but it made me think... In theory, can something large enough to be used as a clock become fully entangled with a copy of...
  16. ISamson

    B How do particles become entangled?

    Hi. I know that particles can become entangled, but I don't understand the actual physical process that the particles are involved into become entangled. Can anyone help me? Thanks.
  17. morrobay

    B Entangled Photon Measurements: A(t) = d/c and B(t) = 5d/c

    Entangled photons in superposition state : | Ψ} = (|HV} - | VH})/1/√2 are sent from source to polarizers and then to detectors A and B ( in this setup distance from source to detectors is equal). If A measures vertical photon she knows immediately that B photon must be horizontally...
  18. I

    Calculate expectation value of entangled 2 state system?

    Homework Statement Homework Equations I know that there are two eigenstates of the operator C: |B> = (1 0) as a column vector with eigenvalue 1 |R> = (0 1) also a column vector with eigenvalue -1 The Attempt at a Solution My work is shown here: If anyone could point me in the right...
  19. F

    A Space is "Entangled", says Leonard Susskind

    In the following youtube video, at 1:10:15, is he saying that space itself is "entangled" by means of the virtual particles of the vacuum energy being entangled? It sounds like this is one of the main points he is trying to make in the video. But if this is so, then isn't he saying that space...
  20. T

    I Quantum entangled image sensor for space camera-telescope

    Could this be a possibility at some point? Since entanglement is not affected by distance, could we send cameras out to extremely distant places and get instantaneous signals? Only the image sensor would have to be entangled. It would still take the same amount of time as usual to get the camera...
  21. R

    I Actual example of a mixed state not part of entangled state

    A mixed state is when the system is actually in one state or another, but you just don't know which, and you use probabilities to describe your uncertainty. I'm referring to a mixed state of the entire system. I want an actual example. Can you think of some? Note I wasn't describing mixed state...
  22. T

    B Understanding Quantum Entanglement: Debunking Common Misconceptions

    I have some questions about quantum entanglement 1 - Why is this phenomenon considered so surprising, if it just states conservation of quantities (e.g. spin, momentum) and we are already accostumed with conservation of quantities in classical physics 2 - Suppose we have, say, a hydrogen...
  23. C

    A Simple way to create entangled photon pairs?

    Two photons arrive at a hypothetical 50:50 Beam-Splitter with no phase shift between reflected and transmitted modes. One enters the Left side and the other the Bottom side of the BS as shown in Fig.1 of the link below: https://drive.google.com/open?id=0B5JsDLKoUSA5emk5Qk9nUHVIelE Each photon...
  24. Noora Alameri

    I Maximally entangled state expression and generalization

    Hey everybody,, I have question related to the expression of the maximally entangled state.. I know that that for W-state its given by ( For three qubits) : psi=(|100>+|010>+|001>)/sqrt(N) and for Disentangled state ( for three qubits) its given as : psi=|111> Where one and 0 represent the...
  25. Chris Miller

    B Is 'Synchronized' a Misleading Term for Entangled Atoms?

    Given a pair of entangled atoms, it's my understanding that the next measurements taken on each will correlate. If, after taking its measurement, before the other is measured, one of the pair is destroyed, it is my understanding that the remaining's initial measurement will be unaffected, as...
  26. L

    B Entangled particles and lorentz contraction?

    can lorentz contraction be measured via quantum entanglement with one of the entangled particles moving near the speed of light? would the particle in motion be affected by lorentz contraction? if so, would the particle at rest follow suit and appear affected?
  27. S

    I Why is entanglement crucial for quantum computing?

    Hello I understand what entanglement is and also what superposition is. But I don't understand why qbits in a quantum computer must be entangled.
  28. G

    I Bell test where observers never were in a common light cone

    Hi. I wonder if following thought experiment (which is most probably impossible to be put into practice) could have any implications concerning interpretations of QM. Consider five parties A, B, C, D and E, lined up in that order and with no relevant relative motion. No pair of them have ever...
  29. C

    Can entangled photons be used to explore black holes?

    Gabriela Lemos and her team successfully entangled photons. Would it be possible to explore the interior of a black hole by letting one of the entangled photons enter beyond the event horizon and observe the impact on the other?
  30. N

    I Are two entangled photons described by the same wavefunction?

    Are two entangled photons described by the same wave function or wave function shape? Heres an example... Say for example, we have a laser in TEM01 mode that is shooting individual photons (this mode as two distinct maxima). Then the individual photons are going through a BBO crystal to become a...
  31. C

    Can three particles be entangled?

    Homework Statement I'm trying to understand the information paradox at a black hole. Can three particles be entangled? I read on a site that it's impossible to entangle multiple particles. When searching on google I found out that it is possible for multiple particles to entangle. So what...
  32. F

    I Two particles: Entangled State vs Non interacting State

    Hello Forum, Could anyone offer some insight on this topic? In the case of a physical system composed of multiple particles, there is only one single wavefunction that depends on the three position variables of each particle and the parameter time t. For example, in the case of 2 particles, we...
  33. edguy99

    I Are fixup operations required for entanglement in photon splitting?

    Photons are prepared in a vertical state (90º), split in a crystal and sent to Bob and Alice. Both Bob and Alice will measure 100% vertical and 0% horizontal. Photons are prepared in a 45º state, split in a crystal and sent to Bob and Alice. Both Bob and Alice will measure 50% vertical and 50%...
  34. M

    I Energy associated with entangled particles

    Assuming two particles are entangled, is there a quantifiable energy associated with separation distance? Rephrasing the question: If two entangled particles are distance x1 apart and another pair of identical entangled particles are distance x2 apart, is there a difference in the energy...
  35. Zafa Pi

    I One Way vs. Entangled Cryptography

    In a recent article (I've lost the reference, but it doesn't matter) it said that employing entangled photons is superior to the usual one way transmission of photons from Alice to Bob for creating a one time pad. It gave no justification for this claim. Can anyone provide me with one?
  36. LarryS

    I Is Energy Entanglement Possible?

    Can two particles be entangled in the energy property/observable? If so, what kind of experiment could verify that the two particles were energy-entangled? Thanks in advance.
  37. K

    A How to calculate the Wigner function for an entangled state

    I'm trying to calculate a Wigner Function of an entangled state, and I'm not quite sure how to proceed. I have created this state by sending in vacuum and a squeezed state into a 50/50 BS, where the output state has a density operator: $$\rho_{34}=S_{3}S_{4}S_{34}|00\rangle_{34}\langle...
  38. I

    B How to create quantum entangled electrons

    I understand that one way of creating quantum entangled electrons is by splitting a Cooper pair. Is then their spin property used in the measurement, as this must always sum to ##0## for a Cooper pair? If that is the case, do quantum entangled electrons only exist in the singlet state, where the...
  39. T

    I Entangled particle on a nanoprobe.

    One entangled particle held on a light sail nanoprobe sent to our nearest star, the other entangled particle in a lab on earth. Could this possibly provide instantaneous communication?
  40. B

    I Entangled system pure state or not?

    According to atty.. entangled system are pure (can be in superposition) while according to Bill.. entangled system are not pure (not in superposition) Here's the prove of what they stated: atty said...
  41. A. Neumaier

    I Entangled particles in the thermal interpretation

    Ah. It was skepticism about publishing, not about giving a comprehensive account! Yes, I am preparing a book on quantum mechanics, which will contain an account of the thermal interpretation - but primarily to macroscopic, nonrelativistic reality, where it is obvious that it gives the correct...
  42. B

    B Can you find a single entangled atom in a haystack.

    If you have a pair of particles (perhaps atoms for example) that are entangled, and one of them is mixed in amongst a whole bunch of other atoms of the same species, yet not entangled; could you differentiate in some way the entangled atom from the rest WITHOUT destroying the existing state of...
  43. K

    I Maximally entangled two-qubit Bell states

    Hello, In the four maximally entangled two-qubit Bell states, what is the difference between the first and the second states, similarly, the difference between the third and the fourth states. What the different in signs mean( +,-)...
  44. entropy1

    I Does macro-object get entangled?

    Suppose we have a pair of entangled particles. Suppose the first particle of the pair interacts with a macro-object and decoheres. Does the macro object get entangled with the second particle?
  45. K

    I What's so strange about entangled particles?

    In a thought experiment, there is a spin-0 source emitting particles. (I suppose you already know what is that experiment.) Two observers in opposite sides along the same axis measure opposite spin components. If one observer measure, say, spin up, then the second observer will certainly measure...
  46. entropy1

    I The mechanism of entangled particles

    First let me ask this: Consider a pair of entangled photons fired at a respective detector after passing respective polarisation filters. If a photon passes a polarisation filter, is it in a superposition of having passed and not having passed? Is the measuring device (that detects the...
  47. J

    B Entangled photons thought experiment

    Following scenario: One million entangled photon pairs are created and are sent to Alice's and Bob's laboratory such that Alice receives 1 million photons(or any other large number) of which each is entangled to one of the million photons Bob receives, their laboratories being at a distance to...
  48. F

    B Entangled Particles: Understanding the Interaction

    Pardon me for asking a very simple question, but this is something that I'm confused about. If we have a pair of entangled particles, and we measure the state of one of the particles, then the state of the other particle becomes fixed instantaneously. But what if we have three entangled...
  49. KarminValso1724

    B Can different types of particles be entangled with one another ?

    For example, can an electron and a photon become entangled?
  50. zonde

    I Are photons from atomic cascade directly entangled?

    As far as I know first entanglement experiment used polarization entangled photons from atomic cascade. As I understand atomic cascade produces entangled photons from two electrons that emit photons by falling from the same orbital to the same lower orbital (so they have the same spin). Now it...
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