Superradiance with local phase-breaking effects

Abstract

We study the superradiant evolution of a set of $N$ two-level systems spontaneously radiating under the effect of phase-breaking mechanisms. We investigate the dynamics generated by non-radiative losses and pure dephasing, and their interplay with spontaneous emission. Our results show that in the parameter region relevant to many solid-state cavity quantum electrodynamics experiments, even with a dephasing rate much faster than the radiative lifetime of a single two-level system, a sub-optimal collective superfluorescent burst is still observable. We also apply our theory to the dilute excitation regime, often used to describe optical excitations in solid-state systems. In this regime, excitations can be described in terms of bright and dark bosonic quasiparticles. We show how the effect of dephasing and losses in this regime translates into inter-mode scattering rates and quasiparticle lifetimes.Comment: 13 pages, 1 table, 4 figures; included a permutational invariant method to explore the exact dynamics of up to N=50 two-level systems and included additional references; as published in Phys. Rev.

Molecular polaritons for controlling chemistry with quantum optics

“…For instance, inhomogeneities such as energy disorder, Rabi disorder and intramolecular vibronic coupling, can give rise to couplings between the totally-symmetric polariton states and non-symmetric material excitations [132][133][134]. It is also known in quantum optics that local dissipative processes such as the presence of local non-radiative relaxation and dephasing, can also drive population away form a totally-symmetric polariton manifold into a dark state reservoir [135]. Moreover, in molecular ensembles with strong vibronic coupling (e.g., rubrene), local effects can lead to the emergence of novel types of vibronic polaritons that have large photonic character, but give emission signals in regions of the spectrum that are seemingly dark in cavity absorption [118,136].…”

Strong coupling of ionizing transitions

“…In the dilute excitation regime, in which the number of excitations in the system is much smaller than N , those operators satisfy bosonic commutation relations [31,50,51] b…”

Superradiant to subradiant phase transition in the open system Dicke model: dark state cascades

“…The connection of this permutation symmetric method to the phase space methods can be seen from the fact that there are exactly N N N 1 [31]. These operator products can also be used to expand the master equation in actual calculations [27,31]. In recent years the permutation symmetric method has been independently rediscovered by different groups using different approaches [22,26,32,33,44,45].…”

“…The open (and closed) system Dicke model has been a work horse in quantum optics and beyond for decades . Current research on Dicke model based systems includes novel laser-like systems [22], phase transitions [19,26], quantum information and super/subradiance [14,17,23,24,27,29]. In recent years superradiance has been investigated with respect to entanglement [23] and subradiance for its prospects to store quantum information [24,29].…”