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Il Nuovo cimento della Società italiana di fisica. B/Il Nuovo cimento B

Distinctive quantum features of electron intensity correlation interferometry

Mark P. Silverman

Published Feb 1, 1987• 40 citations
Publisher
DOI
10.1007/bf02888820

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Recently, a new method of analysing electron correlations based on intensity interferometry has been applied to double ionization of He and Ne by fast ion impact [1]. The data reveal sensitively correlation effects while they appear to be very insensitive to the collision dynamics. In order to analyse the role of the initial state electron correlation a statistically defined correlation function based on intensity interferometry was calculated for the ground state of He. In a comparative study of model wave functions we demonstrate that correlation can be considered from a statistical point of view which offers a new tool to study correlation effects in many-particle systems.
In the field of attosecond science, photoelectron spectroscopy and interferometry stand as a central topic not only for its ability to characterise attosecond pulses but also for its ability to make time resolved measurements of electron dynamics. This feature allows for its application across the many fields which depend on the behaviour of electrons. For these reasons, there is significant interest in improving these techniques. One such candidate is the implementation of quantum light states to replace the typical coherent light used for interferometry. In the past, this was not possible due to the weakness of quantum light sources. However, recent development has shown that high intensity bright squeezed vacuum sources are possible and can be made to have high enough intensities in order to drive nonlinear processes, which allows for possibilities within attosecond science. For this work, we will begin developing and characterising an intense bright squeezed vacuum source to be used for applications in photoelectron metrology.
We show that the quantum state of the electromagnetic field can be determined by performing electron interferometry and exploiting the ac analogue of the Aharonov-Bohm effect. The interferometric phase shift is proportional to the magnetic-flux operator, and measurements of output electron intensity for various interferometer geometries yields the Weyl function, which is the Fourier transform of the Wigner function. In contradistinction to optical methods for state determination, this scheme relies on electron interferometry and could enable probing of intracavity field states. Second-order correlations in this context are also discussed.