ELFT HÍRADÓ

[mcsete AT physx.u-szeged.hu]

Seminar

Speaker: Professor Sándor Varró
ELI ALPS, The Extreme Light Infrastructure ERIC,
Wolfgang Sandner u. 3., 6728 Szeged, Hungary

Date: 3 PM, 17 June (Wednesday) 2026.
Location: University of Szeged, Institute of Physics, Bay Zoltán class-room
https://msteams.link/F9DX

Title:
A quantum concept of attosecond pulses: the attoquant.

Abstract:
The basic constituents of attosecond light pulses are the high-order  
harmonics generated by intense laser fields during the interaction  
with various material targets, like e.g. rare atom gas jets. In the  
simplest picture the different harmonics are emitted during the  
recombination of highly excited electrons of different but  
“synchronized” atoms. Thus, one may assume a regular phase relation  
between the harmonics, and their classical Fourier synthesis results  
in attosecond pulse trains. In the present talk we shall discuss the  
emergence of attosecond pulses from the point of view of quantum  
optics. The reason for this is that the mentioned recombination is in  
fact a spontaneous emission process, and it is far not trivial how can  
one understand the locking of the different harmonic components.  
According to our theoretical study, the process of collective emission  
yields entangled quantum states for the sequences of harmonics, which  
we call “attoquants”. These are symmetric entangled coherent states of  
the emitted many-mode optical radiation, for which even a random  
distribution of the phases results in a locking of the temporal  
Fourier components. We shall present some characteristics of such  
entangled states, and offer a possible quantum optical interpretation  
of the generation of attosecond pulses.

Everyone is welcome to attend.
Dr. Mária Csete



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