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Âé¶¹ÒùÔºicists propose Bell test for probing quantum entanglement

Quantum entanglement test
Schematic representation of the laser pulses to be applied to the Ar+ parent ion subsystem within the entanglement detection protocol. Credit: arXiv (2023). DOI: 10.48550/arxiv.2312.05036

Imperial researchers have proposed a new way to directly probe quantum entanglement, the effect that led to the puzzling concept of "spooky action at a distance," where previously grouped particles' quantum states cannot be described independently of each other. The has been accepted for publication in Âé¶¹ÒùÔºical Review X.

The Bell test seeks to demonstrate that no "hidden variables" are involved in , but has so far only been done for pairs of entangled photons, leading to the 2022 Nobel Prize in Âé¶¹ÒùÔºics.

The team from the Department of Âé¶¹ÒùÔºics, comprising Dr. Marco Ruberti, Professor Vitali Averbukh and Professor Florian Mintert, has come up with a way to use the Bell test for the process of photoionization, where a photon causes an electron to be ejected from an atom, leaving the electron and the resulting ion quantum entangled.

Using advanced many-body theory, the Imperial team succeeded in showing that this could be done by simultaneous measurement of the spin of the photoelectron and the photon emission of the remaining ion.

More information: Marco Ruberti et al, Bell test of quantum entanglement in attosecond photoionization, Âé¶¹ÒùÔºical Review X (2024). . On arXiv:

Journal information: Âé¶¹ÒùÔºical Review X , arXiv

Citation: Âé¶¹ÒùÔºicists propose Bell test for probing quantum entanglement (2024, November 4) retrieved 28 April 2025 from /news/2024-11-physicists-bell-probing-quantum-entanglement.html
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