Complementary collective spin descriptions of superradiant Ramsey spectroscopy
Phys. Rev. A 113, 023716 – Published 18 February, 2026
DOI: https://doi.org/10.1103/nwhs-zwqn
Abstract
A recent experiment demonstrated delayed superradiance from atoms, which are coupled to a longitudinal mode of a cavity while being excited by a laser pulse propagating along a transversal direction [Nat. Commun. 15, 1084 (2024)]. A coherent picture of the atomic ensemble dynamics in this experiment requires complementary representations of the external driving dynamics and the superradiant dynamics. To complement previous analyses, we introduce these representations by considering in-phase and out-of-phase superpositions of transverse collective spin components of two atomic subensembles, and analyze the dynamics with the corresponding collective Dicke states and Bloch vectors. This approach also explains Ramsey spectroscopy experiments based on the delayed superradiance, and it may be employed to explore other intriguing phenomena, such as weak- to strong-coupling phase transitions and triggered superradiance.
