Abstract
The Sauter-Schwinger pair creation from the quantum vacuum driven by a sequence of identical time-dependent electric-field pulses is considered. We show the appearance of intra- and inter-pulse interference structures in momentum distributions of produced pairs. These structures are interpreted in terms of the eigenvalues of the time-evolution operator for an arbitrary eigenmode of the fermionic field. We demonstrate a nearly perfect coherence of inter-pulse structures, which is due to nonadiabatic transitions at avoided crossings of the phases defining the time evolution operator. As we also show, this nearly perfect coherent enhancement can be accidentally lost.
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