Molecular Entanglement Witness by Absorption Spectroscopy in Cavity QED

• URL: http://arxiv.org/abs/2408.14782v1
• Date: Tue, 27 Aug 2024 05:11:57 GMT
• Title: Molecular Entanglement Witness by Absorption Spectroscopy in Cavity QED
• Authors: Weijun Wu, Francesca Fassioli, David A. Huse, Gregory D. Scholes,
• Abstract summary: We study the quantum Fisher information as a multipartite entanglement witness. We show that it is a good inter-molecular entanglement witness for ultrastrong light-matter coupling in cavity quantum electrodynamics. Our work proposes a general protocol to detect inter-molecular entanglement in chemical systems at room temperature.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Producing and maintaining molecular entanglement at room temperature and detecting multipartite entanglement features of macroscopic molecular systems remain key challenges for understanding inter-molecular quantum effects in chemistry. Here, we study the quantum Fisher information, a central concept in quantum metrology, as a multipartite entanglement witness. We generalize the entanglement witness functional related to quantum Fisher information regarding non-identical local response operators. We show that it is a good inter-molecular entanglement witness for ultrastrong light-matter coupling in cavity quantum electrodynamics, including near the superradiant phase transition. We further connect quantum Fisher information to the dipole correlator, which suggests that this entanglement could be detected by absorption spectroscopy. Our work proposes a general protocol to detect inter-molecular entanglement in chemical systems at room temperature.

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