Can you name a few interactions that entangle particles

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Discussion Overview

The discussion revolves around the interactions that can lead to the entanglement of particles, exploring various mechanisms beyond particle decay. Participants seek to identify specific interactions that result in entangled states, with a focus on theoretical and conceptual aspects of quantum entanglement.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • Some participants note that quantum entanglement occurs when particles interact in ways that their quantum states cannot be described independently, suggesting that interactions like those among electrons orbiting the same nucleus lead to entanglement.
  • One participant asserts that almost any interaction between quantum systems has the potential to create entanglement, highlighting that scattering processes, such as Rutherford scattering, can generate entangled states.
  • Another participant introduces the Kondo effect as an example of entanglement, describing how a trapped electron becomes entangled with surrounding electrons, regardless of distance.
  • There is a mention that entanglement can be avoided only when the joint Hamiltonian of the particles can be separated, indicating that independent evolution of particles prevents entanglement.

Areas of Agreement / Disagreement

Participants express various views on the types of interactions that can lead to entanglement, with no consensus reached on a definitive list of interactions. Multiple competing examples and theories are presented.

Contextual Notes

Some assumptions about the nature of interactions and the conditions under which entanglement occurs are not fully explored, and the discussion does not resolve the complexities involved in defining entanglement in different contexts.

sciencejournalist00
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It says everywhere that particle decay is not the only thing that creates entangled particles.

"Quantum entanglement is a physical phenomenon that occurs when pairs or groups of particles are generated or interact in ways such that the quantum state of each particle cannot be described independently — instead, a quantum state may be given for the system as a whole."

It says subatomic particles can get entangled after they interact in special ways.

For example, all the electrons that orbit the same nucleus are entangled.

Can you name other such interactions?
 
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Give only the name of the interaction (for example, Cooper pair production), not reference to papers or mathematical equations, please
 
sciencejournalist00 said:
Give only the name of the interaction (for example, Cooper pair production), not reference to papers or mathematical equations, please

I think you can safely say that almost any interaction between a pair of quantum systems has the potential to create entanglement. In fact, it would be weirder if an interaction between a pair of particles didn't leave them at least slightly entangled.

For starters, any scattering process between two particles can create entanglement (e.g., Rutherford scattering).

The only time you can guarantee that no entanglement is generated is when the joint Hamiltonian can be decomposed into a sum of separate Hamiltonians for each particle, which amounts to them evolving independently of one another in time.
 
Scientists have realized that the Kondo effect results from a relationship between electrons known as "entanglement" in which the quantum state of one electron is tied to those of neighboring electrons, even if the particles are later separated by considerable distances. In the case of Kondo effect, a trapped electron is entangled in a complex manner with a cloud of surrounding electrons.

Read more at: http://phys.org/news/2011-06-electrons-entangled.html#jCp
 

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