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Springer eBooks

Spontaneous Intrinsic Decoherence in Two and Three Slits Young Interference Experiments

Rodolfo Bonifacio, Stefano Olivares

Published Jan 1, 2003• 0 citations
Publisher
DOI
10.1007/978-1-4419-8907-9_7

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We discuss the single-particle Young interference experiment in position space, showing its close relation with the time-dependent Schrodinger spread. In the two-slit case there is always a maximum at the centre of the screen. Here we demonstrate that, with three slits, one can have zero intensity (at the centre) for discrete values of the spacing between the slits and of the distance of the screen. Finally, we show the possibility that spontaneous intrinsic decoherence destroys the interference pattern and that decoherence becomes stronger at the macroscopic limit.
A coherent superposition of two Gaussian wavepackets, which freely evolves in time, gives rise to an interference pattern similar to that of the single-particle double-slit Young's experiment. In this paper we show that fringe visibility can be reduced by spontaneous decoherence, which can also destroy quantum coherence when interaction between a system and its surroundings can be neglected. This decoherence is due to fluctuations in the evolution time and, in general, cannot be achieved when simple classical averages are considered. We compare our theoretical results with a C 60 fullerenes interference experiment, where thermal decoherence is not relevant, but the fringe visibility is actually reduced.