Creation of a squeezed photon distribution using artificial atoms with broken inversion symmetry

Abstract

We consider a two level system with both a transversal and a longitudinal coupling to the electromagnetic field of a resonator. Using a polaron transformation, this Hamiltonian can be mapped onto a Jaynes-Cummings Hamiltonian with generalized field operators acting on the electromagnetic field in the resonator. In contrast to the usual ladder operators a and a † , these operators exhibit a non-monotous coupling strength with respect to the number n of photons in the resonator. Especially, there are roots of the coupling between qubit and resonator at certain photon numbers n0. We show that this effect can be exploited to generate photon-number squeezed light, characterized by a Fano factor F ≪ 1, with a large number of photons (e.g. of the order of 10 4 ).

Beyond the Rabi model: light interactions with polar atomic systems in a cavity

“…Due to the interplay of permanent and induced electric dipole moments, polar systems are a playground where a richer physics of light-matter interactions can be realized: polar quantum systems have been proposed for THz radiation sources [13] based on quantum dots [15] or molecular ensembles [16]. They can be exploited for squeezed light generation [17,18] and they support nonlinear optical absorption [14]. Recently, the impact of spatial asymmetry of a quantum system on its spontaneous emission properties has been investigated [19].…”

Propagation of optically tunable coherent radiation in a gas of polar molecules

“…In Refs. [19][20][21], two-level systems with broken inversion symmetry were suggested for lasing or for generation of squeezed light.…”

Spontaneous emission in dispersive media without point-dipole approximation

“…Accounting for the internal structure of atomic systems can lead to much more than quantitative corrections of their optical properties; actually, effects like spatial asymmetry may give rise to appealing new applications, such as optically-tunable lowfrequency radiation sources based on resonantly driven systems [23,24,25]. Scenarios exploiting systems with broken inversion symmetry were proposed for light squeezing [26] and lasing [27]. The asymmetry has already been studied in the context of a coherent driving field [28,29] with a long list of recent experiments which involve quantum piezoelectricity [30], quantum dots [30], dye molecules [31], spin-echo [32], Ramsey interferometer [33], crystal centers [34,13], and graphene [35,36].…”