Origin of entanglement in an H(<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mn>2</mn><mi>p</mi></mrow></math>) atom pair produced through the photodissociation of an <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub></math> molecule

Kouichi Hosaka; Yutaro Torizuka; Philipp Schmidt; Takeshi Odagiri; Arno Ehresmann; Masashi Kitajima; Noriyuki Kouchi

doi:10.1103/g7tj-mkqt

Origin of entanglement in an H( $2 p$ ) atom pair produced through the photodissociation of an $H_{2}$ molecule

Kouichi Hosaka ^1,2, Yutaro Torizuka², Philipp Schmidt ³, Takeshi Odagiri ⁴, Arno Ehresmann ³, Masashi Kitajima ², and Noriyuki Kouchi ^2,*

¹Quantum Materials and Applications Research Center, National Institutes for Quantum Science and Technology, Takasaki, Gunma 370-1292, Japan
²Department of Chemistry, Institute of Science Tokyo (formerly Tokyo Institute of Technology), Meguro-ku, Tokyo 152-8551, Japan
³Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
⁴Department of Materials and Life Sciences, Sophia University, Chiyoda-ku, Tokyo 102-8554, Japan

^*Contact author: nkouchi@chem.titech.ac.jp

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Phys. Rev. A 112, 013106 – Published 7 July, 2025

DOI: https://doi.org/10.1103/g7tj-mkqt

Abstract

In this paper, as a continuation of our recent article demonstrating that the $2 p$ atom pair is entangled in the $H_{2}$ photodissociation [Phys. Rev. A 111, 023116 (2025)], we have discovered the origins of the entanglement for the $2 p$ atom-pair state and obtained the entanglement entropies by origins. The same investigation has been carried out for the precursor molecular state of the $2 p$ atom pair. The reason for the increase of the entanglement entropy during the dissociation from the precursor molecule into the $H (2 p) + H (2 p)$ atom pair has been made clear.

Physical Review A

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Origin of entanglement in an H( $2 p$ ) atom pair produced through the photodissociation of an $H_{2}$ molecule

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Origin of entanglement in an H(2p) atom pair produced through the photodissociation of an H2 molecule

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Origin of entanglement in an H( $2 p$ ) atom pair produced through the photodissociation of an $H_{2}$ molecule