Schwinger pair spin correlations depend on the momentum direction: transverse momentum produces spin states that are not maximally entangled Bell states.
Entanglement Generation by Electric Field Background
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abstract
The quantum vacuum is unstable under the influence of an external electric field and decays into pairs of charged particles, a process which is known as the Schwinger pair production. We propose and demonstrate that this electric field can generate entanglement. Using the Schwinger pair production for constant and pulsed electric fields, we study entanglement for scalar particles with zero spins and Dirac fermions. One can observe the variation of the entanglement produced for bosonic and fermionic modes with respect to different parameters.
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State of a particle pair produced by the Schwinger effect is not necessarily a maximally entangled Bell state
Schwinger pair spin correlations depend on the momentum direction: transverse momentum produces spin states that are not maximally entangled Bell states.