Entanglement (split from Using entanglement to achieve...)

[bangstrom]

A non-local, faster-than-light correlation involves a non-local, faster-than-light communication when the transaction between the particles is correlated rather than random. Correlation requires a comunication even if it is a “spooky" action at a distance.

Also, a time-symetric transaction is simultaneous in time on both ends. It only appears to be either forward or backward in time when viewed from one end or the other.

https://arxiv.org/pdf/2006.11365

“Article: Symmetry, Transactions, and the Mechanism of Wave Function Collapse

"Abstract: The Transactional Interpretation of quantum mechanics exploits the intrinsic time-symmetry of wave mechanics to interpret the ψ and ψ* wave functions present in all wave mechanics calculations as representing retarded and advanced waves moving in opposite time directions that form a quantum “handshake” or transaction. This handshake is a 4D standing-wave that builds up across space-time to transfer the conserved quantities of energy, momentum, and angular momentum in an interaction. Here, we derive a two-atom quantum formalism describing a transaction.” John Cramer and Carver Mead 2020

[Markus Hanke]

6 hours ago, bangstrom said:

A non-local, faster-than-light correlation involves a non-local, faster-than-light communication

No, not necessarily. While all causation automatically involves some form of correlation, the reverse isn’t true - not all correlation implies causation, in the sense of something “acting” non-locally.

[bangstrom]

4 hours ago, Markus Hanke said:

No, not necessarily. While all causation automatically involves some form of correlation, the reverse isn’t true - not all correlation implies causation, in the sense of something “acting” non-locally.

Is entanglement possible without correlation and what causes particles to become entangled?

 With entangled particles, where the interacting particles begin with anti-coordinated quantum identities- for example, one is spin up and the other spin down- when the common wavefunction is lost, the particles may be observed as having quantum identities opposite that of their original conditions. It is as if something has caused the particles to swap places. The original identities of entangled particles is always unknown but the odds of finding the particles anti-coordinated after the collapse of the wavefunction is greater than even as demonstrated by tests of Bell’s Inequalities indicating that a casual event has taken place. The same sort of coordination is best demonstrated in experiments involving quantum teleportation where something causes two remote particles to appear to swap locations with neither particle traveling through the space between. The only thing passing through space is ‘information.’ The spin-up particle is informed to spin-down and the spin-down particle is simultaneously informed to spin up.

With light, the same principle applies except the quantum identities of the paired electrons that swap places are the locations of the electrons within the atoms rather than something like spin as with my previous example. An electron in one atom has an energy level above its ground state while its entangled partner has an energy level below its ground state. When their common wavefunction collapses, the wavefunction allows the higher energy electron to drop to a lower energy orbit while its partner simultaneously rises to a higher energy orbit. ‘Information’ is the only thing that passes through the space between. Energy is conserved in this transaction rather than flying through the void looking for a place to land.  In this view, the non-local entanglement among charged particles allows remote particles to swap energy levels simultaneously with no need for a local transfer of energy through the space between. This is the cause of what we observe as light.

[swansont]

14 minutes ago, bangstrom said:

With entangled particles, where the interacting particles begin with anti-coordinated quantum identities- for example, one is spin up and the other spin down- when the common wavefunction is lost, the particles may be observed as having quantum identities opposite that of their original conditions. It is as if something has caused the particles to swap places

No. In entanglement, you don’t know the individual states. If you start out knowing, something must happen in the entangling interaction so that you lose track. 

21 minutes ago, bangstrom said:

With light, the same principle applies except the quantum identities of the paired electrons that swap places are the locations of the electrons within the atoms rather than something like spin as with my previous example. An electron in one atom has an energy level above its ground state while its entangled partner has an energy level below its ground state. When their common wavefunction collapses, the wavefunction allows the higher energy electron to drop to a lower energy orbit while its partner simultaneously rises to a higher energy orbit. ‘Information’ is the only thing that passes through the space between. Energy is conserved in this transaction rather than flying through the void looking for a place to land

The atoms would be in a superposition, rather than one in a higher and one in a lower state (and “below the ground state” is nonsense)

[bangstrom]

10 hours ago, swansont said:

No. In entanglement, you don’t know the individual states. If you start out knowing, something must happen in the entangling interaction so that you lose track. 

The atoms would be in a superposition, rather than one in a higher and one in a lower state (and “below the ground state” is nonsense)

As I said, it is impossible to know the original states of entangled particles but tests of the Bell’s inequality demonstrate that the quantum identities in the after states are not necessarily the same as in the original states as if the entangled particles had nonlocally swapped locations. This possibility is demonstrated directly with experiments involving quantum teleportation where entangled particles swap identities nonlocally without either particle physically passing through the space between.

This swapping places is never seen at the macro level but it is observed at the quantum level with entangled particles. We know the Eiffel Tower is in Paris and the Leaning Tower is in Pizza but, in the quantum world, we could find the Leaning Tower in Paris and instantly know that the Eiffel Tower must now be in Pizza. We don’t know the identity of either entangled particle until after it is observed.

The energy state of entangled particles is unknown and unknowable until after the collapse of the wavefunction- not during which, as you say, is nonsense.

[swansont]

2 hours ago, bangstrom said:

As I said, it is impossible to know the original states of entangled particles but tests of the Bell’s inequality demonstrate that the quantum identities in the after states are not necessarily the same as in the original states

Which is a meaningless observation, since they must interact in order to become entangled, and interactions affect the states of particles.

Quote

This possibility is demonstrated directly with experiments involving quantum teleportation where entangled particles swap identities nonlocally without either particle physically passing through the space between

It’s not the identity that‘s swapped - e.g. an electron doesn’t become another kind of particle, and electrons are identical particles. The state of the particle is what is teleported.

Quote

This swapping places is never seen at the macro level but it is observed at the quantum level with entangled particles. We know the Eiffel Tower is in Paris and the Leaning Tower is in Pizza but, in the quantum world, we could find the Leaning Tower in Paris and instantly know that the Eiffel Tower must now be in Pizza. We don’t know the identity of either entangled particle until after it is observed.

If you think this is a good analogy it suggests you don’t know all that much about quantum teleportation. 

[Markus Hanke]

16 hours ago, bangstrom said:

Is entanglement possible without correlation

No. Entanglement is correlation between measurement outcomes.

16 hours ago, bangstrom said:

what causes particles to become entangled?

They need to interact first (in some ordinary way, not at a distance), which establishes the entanglement relationship. There are different ways to do this, but they all involve an initial causal interaction of some kind; they then remain entangled afterwards, right up until a measurement is performed on them; once any entangled part collapses into a definite state, the entanglement relationship is broken.

[Eise]

@bangstrom: starting the same chain of misunderstandings again? 

See:

If you have any new ideas, let us know otherwise this discussion is meaningless. The other thread was closed because we were running in circles.

 

[bangstrom]

3 hours ago, swansont said:

Which is a meaningless observation, since they must interact in order to become entangled, and interactions affect the states of particles.

Naturally, they must interact to become entangled. I said, “It is impossible to know the original states of entangled particles.” Not knowing the original states does not make interaction impossible.

 

3 hours ago, swansont said:

It’s not the identity that‘s swapped - e.g. an electron doesn’t become another kind of particle, and electrons are identical particles. The state of the particle is what is teleported.

How is the “state” of a particle different from the “quantum identity” of a particle? Electrons have the same intrinsic properties (that is, state-independent) properties that make them indistinguishable. An electron does not become another kind of particle. I have read that entangled particles can transpose their quantum identities, such as spin or orientation, so "quantum identity" is what I call it. You may call it “state” but I call it “identity”. I see the difference as semantic.

 

3 hours ago, swansont said:

If you think this is a good analogy it suggests you don’t know all that much about quantum teleportation. 

I admit the towers analogy was a bit over the top but it was an exaggeration to make a point, as analogies often are, if you know all that much about analogies.

[exchemist]

3 hours ago, swansont said:

Which is a meaningless observation, since they must interact in order to become entangled, and interactions affect the states of particles.

It’s not the identity that‘s swapped - e.g. an electron doesn’t become another kind of particle, and electrons are identical particles. The state of the particle is what is teleported.

If you think this is a good analogy it suggests you don’t know all that much about quantum teleportation. 

And the Leaning Tower of Pizza is what you get when your Deliveroo courier stacks them too high.

[bangstrom]

1 hour ago, Markus Hanke said:

No. Entanglement is correlation between measurement outcomes.

Agreed.

1 hour ago, Markus Hanke said:

They need to interact first (in some ordinary way, not at a distance), which establishes the entanglement relationship. There are different ways to do this, but they all involve an initial causal interaction of some kind; they then remain entangled afterwards, right up until a measurement is performed on them; once any entangled part collapses into a definite state, the entanglement relationship is broken.

Agreed, with the exception of (at a distance). In non-photon models, such as John Cramer's, any two electrons having a common resonate frequency and with the space between permitting among other conditions, can become entangled.  

Correction: John Cramer's model includes photons as quanta of energy involved in light-related events. He does not consider photons to be real in the conventional sense as space-traveling particles carrying energy from place to place. Similar models have banned the word 'photon' from their lexicon to avoid confusion with considering photons as particles.

34 minutes ago, exchemist said:

And the Leaning Tower of Pizza is what you get when your Deliveroo courier stacks them too high.

Good observation! I noticed the city in Italy is Pisa too late.

Edited 3 hours ago by bangstrom
Cramer's model is not a photon as a particle model.