Decay of entangled fermion pairs with post-selection
- URL: http://arxiv.org/abs/2308.07412v3
- Date: Wed, 20 Dec 2023 08:13:41 GMT
- Title: Decay of entangled fermion pairs with post-selection
- Authors: J. A. Aguilar-Saavedra
- Abstract summary: After decay of one fermion, a spin measurement is performed on the surviving partner.
The measurement not only projects the spin of the surviving fermion, but is also physically equivalent to a spin projection for the decayed one.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We consider a pair of unstable fermions in a spin-entangled state. After the
decay of one fermion, a spin measurement is performed on the surviving partner,
with a Stern-Gerlach experiment or similar. The measurement not only projects
the spin of the surviving fermion, but is also physically equivalent to a spin
projection for the decayed one -- even when it no longer exists. This
post-selection effect would be experimentally accessible using muon pairs in a
maximally-entangled state, produced either in the decay of a scalar particle,
or in $e^+ e^-$ collisions at wide angles.
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