Nonreciprocal Superradiant Phase Transitions and Multicriticality in a Cavity QED System
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2024
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866917788917956608 |
|---|---|
| author | Zhu, Gui-Lei Hu, Chang-Sheng Wang, Hui Qin, Wei Lü, Xin-You Nori, Franco |
| author_facet | Zhu, Gui-Lei Hu, Chang-Sheng Wang, Hui Qin, Wei Lü, Xin-You Nori, Franco |
| contents | We demonstrate the emergence of nonreciprocal superradiant phase transitions and novel multicriticality in a cavity quantum electrodynamics (QED) system, where a two-level atom interacts with two counter-propagating modes of a whispering-gallery-mode (WGM) microcavity. The cavity rotates at a certain angular velocity, and is directionally squeezed by a unidirectional parametric pumping $χ^{(2)}$ nonlinearity. The combination of cavity rotation and directional squeezing leads to nonreciprocal first- and second-order superradiant phase transitions. These transitions do not require ultrastrong atom-field couplings and can be easily controlled by the external pump field. Through a full quantum description of the system Hamiltonian, we identify two types of multicritical points in the phase diagram, both of which exhibit controllable nonreciprocity. These results open a new door for all-optical manipulation of superradiant transitions and multicritical behaviors in light-matter systems, with potential applications in engineering various integrated nonreciprocal quantum devices |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_13623 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Nonreciprocal Superradiant Phase Transitions and Multicriticality in a Cavity QED System Zhu, Gui-Lei Hu, Chang-Sheng Wang, Hui Qin, Wei Lü, Xin-You Nori, Franco Quantum Physics We demonstrate the emergence of nonreciprocal superradiant phase transitions and novel multicriticality in a cavity quantum electrodynamics (QED) system, where a two-level atom interacts with two counter-propagating modes of a whispering-gallery-mode (WGM) microcavity. The cavity rotates at a certain angular velocity, and is directionally squeezed by a unidirectional parametric pumping $χ^{(2)}$ nonlinearity. The combination of cavity rotation and directional squeezing leads to nonreciprocal first- and second-order superradiant phase transitions. These transitions do not require ultrastrong atom-field couplings and can be easily controlled by the external pump field. Through a full quantum description of the system Hamiltonian, we identify two types of multicritical points in the phase diagram, both of which exhibit controllable nonreciprocity. These results open a new door for all-optical manipulation of superradiant transitions and multicritical behaviors in light-matter systems, with potential applications in engineering various integrated nonreciprocal quantum devices |
| title | Nonreciprocal Superradiant Phase Transitions and Multicriticality in a Cavity QED System |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2405.13623 |