  The influence of potential well width on electron-positron pair production
has been examined through theoretical and numerical approaches by employing the
computational quantum field theory. Quantum interference effects in pair
production is investigated in the two overlapped potential wells with varied
widths and frequencies. Several dominant processes, involving the absorption of
an integer number of photons, significantly impact on pair production. Notably,
specific multiphoton absorption processes exhibit distinct changes as the
potential well width expands, with the absorption of four photons process
displaying noteworthy effects. Additionally, the influence of the smaller
frequency to the yield of the pair production can not be ignored and the most
optimized frequencies in our overlapped fields has been studied and exhibited.
