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In this paper, we use the Weisskopf-Wigner theory to study the entanglementin the state of the free-space radiation field produced from vacuum due toatomic decay. We show how bipartite entanglement is shared between differentpartitions of the radiation modes. We investigate the role played by the sizeof the partitions and their detuning with the decaying atom. The dynamics ofthe atom-field entanglement during the atomic decay is also briefly discussed.  From this dynamics, we assert that such entanglement is the physical quantitythat fix the statistical atomic decay time.

Entanglement in Weisskopf-Wigner theory of atomic decay in free space