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.
American Journal of Physics
- Pub Date:
- January 2005
- Educational aids;
- Tunneling traversal time quantum Zeno dynamics;
- Quantum Physics
- 10 pages, no figures, research paper