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Quantum fluctuations and correlations in open quantum Dicke models

Boneberg, Mario; Lesanovsky, Igor; Carollo, Federico

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Mario Boneberg

Federico Carollo


In the vicinity of ground-state phase transitions quantum correlations can display nonanalytic behavior and critical scaling. This signature of emergent collective effects has been widely investigated within a broad range of equilibrium settings. However, under nonequilibrium conditions, as found in open quantum many-body systems, characterizing quantum correlations near phase transitions is challenging. Moreover, the impact of local and collective dissipative processes on quantum correlations is not broadly understood. Here we consider as a paradigmatic setting the superradiant phase transition of the open quantum Dicke model and characterize quantum and classical correlations across the phase diagram. We develop an approach to quantum fluctuations which allows us to show that local dissipation, which cannot be treated within the commonly employed Holstein-Primakoff approximation, rather unexpectedly leads to an enhancement of collective quantum correlations, and to the emergence of a nonequilibrium superradiant phase in which the bosonic and spin degrees of freedom of the Dicke model are entangled.


Boneberg, M., Lesanovsky, I., & Carollo, F. (2022). Quantum fluctuations and correlations in open quantum Dicke models. Physical Review A, 106(1), Article 012212.

Journal Article Type Article
Acceptance Date Jun 29, 2022
Online Publication Date Jul 19, 2022
Publication Date Jul 1, 2022
Deposit Date Jul 25, 2022
Publicly Available Date Aug 16, 2022
Journal Physical Review A
Print ISSN 2469-9926
Electronic ISSN 2469-9934
Publisher American Physical Society (APS)
Peer Reviewed Peer Reviewed
Volume 106
Issue 1
Article Number 012212
Public URL
Publisher URL


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