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Unraveling Dicke Superradiant Decay with Separable Coherent Spin States
P Rosario1,2, L O R Solak1,2, A Cidrim1
1Universidade Federal de São Carlos, Departamento de Física, Rodovia Washington Luís, km 235-SP-310, 13565-905 São Carlos, São Paulo, Brazil.
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.
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