Entanglement in QFT: Free Particle Decay

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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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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
 

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