Volume 128, Number 4, November 2019
|Number of page(s)||7|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||30 January 2020|
Subradiance in multiply excited states of dipole-coupled V-type atoms
Institut für Theoretische Physik, Universität Innsbruck - Technikerstr. 21a, A-6020 Innsbruck, Austria
Received: 5 July 2019
Accepted: 26 November 2019
We generalize the theoretical modeling of collective atomic super- and subradiance to the multilevel case including spontaneous emission from several excited states towards a common ground state. We show that in a closely packed ensemble of N atoms with N –1 distinct excited states each, one can find a new class of non-radiating dark states, which allows for long-term storage of N –1 photonic excitations. Via dipole-dipole coupling only a single atom in the ground state is sufficient in order to suppress the decay of all N –1 other atoms. By means of some generic geometric configurations, like a triangle of V-type atoms or a chain of atoms with a transition, we study such subradiance including dipole-dipole interactions and show that even at finite distances long lifetimes can be observed. While generally hard to prepare deterministically, we identify various possibilities for a probabilistic preparation via a phase-controlled laser pump and decay.
PACS: 42.50.Nn – Quantum optical phenomena in absorbing, amplifying, dispersive and conducting media; cooperative phenomena in quantum optical systems / 03.67.Bg – Entanglement production and manipulation
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