Entanglement in QFT: Free Particle Decay

In summary, entanglement can be defined in the language of non-relativistic QM and QFT can also define entanglement, as seen in examples such as the decay of a free, massive particle into two other massive particles with entangled linear momentum.
  • #1
LarryS
Gold Member
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All definitions of entanglement, that I have encountered, were expressed in the language of non-relativistic QM.

Suppose a free, massive particle decays into 2 other massive particles. The 2 new particles would be entangled in linear momentum. Can QFT define that type of entanglement? Any examples?

Thanks in advance.
 
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  • #2
referframe said:
All definitions of entanglement, that I have encountered, were expressed in the language of non-relativistic QM.

Suppose a free, massive particle decays into 2 other massive particles. The 2 new particles would be entangled in linear momentum. Can QFT define that type of entanglement?
Yes.

referframe said:
Any examples?
See e.g.
http://xxx.lanl.gov/abs/1205.1992
 

FAQ: Entanglement in QFT: Free Particle Decay

What is entanglement in quantum field theory (QFT)?

Entanglement in QFT refers to the phenomenon where two or more quantum particles become correlated in such a way that the state of one particle cannot be described independently of the state of the other particles, even when they are separated by large distances.

How does entanglement manifest in free particle decay?

In free particle decay, entanglement occurs when a particle decays into two or more particles, resulting in a state where the properties of the particles are entangled. This means that the properties of one particle cannot be described without also taking into account the properties of the other particles.

What are the implications of entanglement in QFT for particle decay?

The presence of entanglement in QFT has important implications for particle decay. It means that the decay process cannot be fully described using classical physics, and that the properties of the particles involved are not independent from one another. This has significant implications for our understanding of the fundamental laws of nature.

Can entanglement be observed in particle decay experiments?

Yes, entanglement has been observed in numerous particle decay experiments, including those involving the decay of B mesons and kaons. These experiments provide strong evidence for the presence of entanglement in QFT and have helped to further our understanding of this phenomenon.

How does entanglement in QFT impact our understanding of the universe?

Entanglement in QFT challenges our traditional understanding of the universe as described by classical physics. It suggests that particles and their properties are interconnected in ways that cannot be explained by classical laws, and that our understanding of reality may need to be expanded to incorporate this phenomenon.

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