Quantum tunneling time

P. C. W. Davies

    Research output: Contribution to journalArticlepeer-review

    59 Citations (Scopus)


    A simple model of a quantum clock is applied to the old and controversial problem of how long a particle takes to tunnel through a quantum barrier. The model has the advantage of yielding sensible results for energy eigenstates and does not require the use of time-dependent wave packets. Although the treatment does not forbid superluminal tunneling velocities, there is no implication of faster-than-light signaling because only the transit duration is measurable, not the absolute time of transit. A comparison is given with the weak-measurement post-selection calculations of Steinberg.
    Original languageEnglish
    Pages (from-to)23-27
    Number of pages5
    JournalAmerican Journal of Physics
    Issue number1
    Publication statusPublished - 2005


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