Generation of entanglement using a short-wavelength seeded free-electron laser
Abstract
Quantum entanglement between the degrees of freedom encountered in the classical world is challenging to observe due to the surrounding environment. To elucidate this issue, we investigate the entanglement generated over ultrafast timescales in a bipartite quantum system comprising two massive particles: a free-moving photoelectron, which expands to a mesoscopic length-scale, and a light-dressed atomic ion, which represents a hybrid state of light and matter. Although the photoelectron spectra are measured classically, the entanglement allows us to reveal information about the dressed-state dynamics of the ion and the femtosecond extreme ultraviolet pulses delivered by a seeded free-electron laser. The observed generation of entanglement is interpreted using the time-dependent von Neumann entropy. Our results unveil the potential for using short-wavelength coherent light pulses from free-electron lasers to generate entangled photoelectron and ion systems for studying spooky action at a distance.
Keywords
Cite
@article{arxiv.2312.04442,
title = {Generation of entanglement using a short-wavelength seeded free-electron laser},
author = {Saikat Nandi and Axel Stenquist and Asimina Papoulia and Edvin Olofsson and Laura Badano and Mattias Bertolino and David Busto and Carlo Callegari and Stefanos Carlström and Miltcho B. Danailov and Philipp V. Demekhin and Michele Di Fraia and Per Eng-Johnsson and Raimund Feifel and Guillaume Gallician and Luca Giannessi and Mathieu Gisselbrecht and Michele Manfredda and Michael Meyer and Catalin Miron and Jasper Peschel and Oksana Plekan and Kevin C. Prince and Richard J. Squibb and Marco Zangrando and Felipe Zapata and Shiyang Zhong and Jan Marcus Dahlström},
journal= {arXiv preprint arXiv:2312.04442},
year = {2024}
}
Comments
22 pages, 4 figures, typos corrected in the updated version