Dicke states in multiple quantum dots

Abstract

We present a theoretical study of the collective optical effects which can occur in groups of three and four quantum dots. We define conditions for stable subradiant (dark) states, rapidly decaying superradiant states, and spontaneous trapping of excitation. Each quantum dot is treated like a twolevel system. The quantum dots are though realistic, meaning that they may have different transition energies and dipole moments. The dots interact via a short-range coupling which allows excitation transfer across the dots, but conserves the total population. We calculate the time evolution of singleand biexciton states using the Linblad equation. In the steady state the individual populations of each dot may have permanent oscillations with frequencies given by the energy separation between the subradiant eigenstates.

Generating resonating-valence-bond states through Dicke subradiance

“…We have shown that a null measurement for photon emission can be used to generate RVB states with high entanglement. Our work builds upon earlier studies of measurement-induced entanglement [34][35][36][37][38], subradiance in quantum dots [39] and vacuum-induced coherence [40,41]. These works follow a stochastic approach requiring averaging over several measurements to generate entangled density matrices.…”

Collective dynamics in a laser-pumped mixture of two atomic ensembles

“…This weakness is proved to be removable lately by a redesign of the Ramseypulse sequence [14]. Meanwhile the research on the collective spontaneous emission extends to solid ensembles, such as an ensemble of quantum dots [15,16], where the excitation can be transferred via charge tunneling [17], long-range radiative interaction, or dipole-dipole interaction [18,19]. Also, an ensemble of Rydberg atoms has strong dipole-dipole interactions and long radiative lifetimes [20] and this makes it interesting for the research of many-body quantum physics [21][22][23][24].…”

Phase dependence of the unnormalized second-order photon correlation function

“…Dicke states in multiple quantum dots systems were discussed too, in Ref. [21]. Furthermore, sub-and super-radiance phenomena in quantum dot nanolasers were investigated in [22].…”