Potential Barrier Classification by Short-Time Measurement

Details Potential Barrier Classification by Short-Time Measurement Potential Barrier Classification by Short-Time Measurement

2006-01-11

arxiv.org/abs/quant-ph/0601069v1

Physics

Quantum Physics

6 pages, 5 figures

Scientific paper

10.1103/PhysRevA.73.032111

We investigate the short-time dynamics of a delta-function potential barrier on an initially confined wave-packet. There are mainly two conclusions: A) At short times the probability density of the first particles that passed through the barrier is unaffected by it. B) When the barrier is absorptive (i.e., its potential is imaginary) it affects the transmitted wave function at shorter times than a real potential barrier. Therefore, it is possible to distinguish between an imaginary and a real potential barrier by measuring its effect at short times only on the transmitting wavefunction.

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