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Physics Letters A

An exact determination of the mean dwell time based on the quantum clock of Salecker and Wigner

C. Richard Leavens, W. R. McKinnon

Published Jan 1, 1994• 41 citations
Publisher
DOI
10.1016/0375-9601(94)00694-k

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We reexamine the Salecker-Wigner-Peres clock formalism and show that it can be directly applied to the phenomenon of tunneling. Then we apply this formalism to the determination of the tunneling time of a nonrelativistic wave packet, sharply concentrated around a tunneling energy, incident on a symmetric double-barrier potential. In order to deepen the discussion about the generalized Hartman effect, we consider the case in which the clock runs only when the particle can be found inside the region between the barriers and show that, whenever the probability to find the particle in this region is non-negligible, the corresponding time (which in this case turns out to be a dwell time) increases with barrier spacing.