An operator-algebraic definition of timelike entanglement entropy in QFT is shown to be real-valued via the timelike tube theorem.
On the duality condition for a hermitian scalar field.Journal of Mathematical Physics, 16(4):985–1007, 1975
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Timelike entanglement entropy Revisited
An operator-algebraic definition of timelike entanglement entropy in QFT is shown to be real-valued via the timelike tube theorem.