Phys Rev Lett. 2025 Sep 26;135(13):133602. doi: 10.1103/xcxr-sm9c.
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.
PMID:41076678 | DOI:10.1103/xcxr-sm9c
