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Lecture notes in physics

Double-Slit Experiments in the Time Domain

G. G. Paulus, D. Bauer

Published Jan 1, 2009• 9 citations
Publisher
DOI
10.1007/978-3-642-03174-8_11

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The temporal analog of the double slit experiment carried out by a research team led by Riccardo Sapienza has gained a lot of attention. The experiment is a generalization of the regular double slit experiment to the time domain. The results of the experiment challenge the existing views of quantum physics and it is interesting to see whether the zero energy ontology (ZEO) to which TGD inspired quantum measurement theory is based, could provide new insights about the experiment. The basic outcome of the considerations is that at least at the level of principle it is possible to determine the classical EM fields in the geometric past after a pair of "big" state functions, which are the TGD counterparts of ordinary state function reductions and change the arrow of geometric time. Violations of classical causality based on finite signal velocity would serve as a support for the ZEO.
A new scheme for a double-slit experiment in the time domain is presented. Phase-stabilized few-cycle laser pulses open one to two windows (slits) of attosecond duration for photoionization. Fringes in the angle-resolved energy spectrum of varying visibility depending on the degree of which-way information are measured. A situation in which one and the same electron encounters a single and a double slit at the same time is observed. The investigation of the fringes makes possible interferometry on the attosecond time scale. From the number of visible fringes, for example, one derives that the slits are extended over about 500 as.