Unraveling Dicke Superradiant Decay with Separable Coherent Spin States
Pedro Rosario, Luiz O. R. Solak, A. Cidrim, R. Bachelard, Johannes Schachenmayer
Published: 2025/4/18
Abstract
We show that idealized Dicke superradiant decay from a fully inverted state can at all times be described by a positive statistical mixture of coherent spin states (CSS). Since CSS are separable, this implies that no entanglement is involved in Dicke decay. Based on this result, we introduce a new numerical quantum trajectory approach leading to low-entanglement unravelings. This opens up new possibilities for employing matrix product state (MPS) techniques for large-scale numerical simulations with collective decay processes.