Details
| Original language | Undefined/Unknown |
|---|---|
| Pages (from-to) | 829-846 |
| Number of pages | 18 |
| Journal | Found. Phys. |
| Volume | 39 |
| Publication status | Published - 2009 |
Abstract
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In: Found. Phys., Vol. 39, 2009, p. 829-846.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Tunneling Times with Covariant Measurements
AU - Kiukas, J.
AU - Ruschhaupt, A.
AU - Werner, R. F.
N1 - Funding information: Acknowledgement One of the authors (J.K.) was supported by Finnish Cultural Foundation during the preparation of the manuscript.
PY - 2009
Y1 - 2009
N2 - We consider the time delay of massive, non-relativistic, one-dimensional particles due to a tunneling potential. In this setting the well-known Hartman effect asserts that often the sub-ensemble of particles going through the tunnel seems to cross the tunnel region instantaneously. An obstacle to the utilization of this effect for getting faster signals is the exponential damping by the tunnel, so there seems to be a trade-off between speedup and intensity. In this paper we prove that this trade-off is never in favor of faster signals: the probability for a signal to reach its destination before some deadline is always reduced by the tunnel, for arbitrary incoming states, arbitrary positive and compactly supported tunnel potentials, and arbitrary detectors. More specifically, we show this for several different ways to define the same incoming state and the same detector when comparing the settings with and without tunnel potential. The arrival time measurements are expressed in the time-covariant approach, but we also allow the detection to be a localization measurement at a later time.
AB - We consider the time delay of massive, non-relativistic, one-dimensional particles due to a tunneling potential. In this setting the well-known Hartman effect asserts that often the sub-ensemble of particles going through the tunnel seems to cross the tunnel region instantaneously. An obstacle to the utilization of this effect for getting faster signals is the exponential damping by the tunnel, so there seems to be a trade-off between speedup and intensity. In this paper we prove that this trade-off is never in favor of faster signals: the probability for a signal to reach its destination before some deadline is always reduced by the tunnel, for arbitrary incoming states, arbitrary positive and compactly supported tunnel potentials, and arbitrary detectors. More specifically, we show this for several different ways to define the same incoming state and the same detector when comparing the settings with and without tunnel potential. The arrival time measurements are expressed in the time-covariant approach, but we also allow the detection to be a localization measurement at a later time.
U2 - 10.1007/s10701-009-9275-z
DO - 10.1007/s10701-009-9275-z
M3 - Article
VL - 39
SP - 829
EP - 846
JO - Found. Phys.
JF - Found. Phys.
SN - 1572-9516
ER -