Generation of correlated photon pairs in different frequency ranges

Abstract

The feasibility to generate correlated photon pairs at variable frequencies is investigated. For this purpose, we consider the interaction of an off-resonant laser field with a two-level system possessing broken inversion symmetry. We show that the system generates non-classical photon pairs exhibiting strong intensity-intensity correlations. The intensity of the applied laser tunes the degree of correlation while the detuning controls the frequency of one of the photons which can be in the THz-domain. Furthermore, we observe the violation of a Cauchy-Schwarz inequality characterizing these photons.

Optical and microwave control of resonance fluorescence and squeezing spectra in a polar molecule

“…The existence of nonzero PDMs has been experimentally observed in several systems [31][32][33][34][35][36][37]. Furthermore, the presence of PDMs considerably influences the optical response of a system [38][39][40] leading, for example, to changes in multiphoton resonant excitation [41][42][43], modifications of the saturation of absorption and dispersion [44], creation of second-harmonic generation [45] and correlated photon pairs [46], as well as the opening of new optical transitions [47][48][49]. The bichromatic excitation of quantum systems with PDMs has been studied in a wide range of quantum systems, including electron and nuclear spins [50,51], QDs [52,53], and superconducting qubits [54].…”

Dynamics of a quantum oscillator coupled with a three-level Λ-type emitter

“…n−1 − 2κ(1 +n) × (n − 1)P (13) n − (n + 1)P (13) n+1 + 2P (11) n − 2κnn × P (13) n − P (13) n−1 −γ (13) 13 P (13) n , P (14) n = 2iδP (13) n + ig (n − 1)P (8) n − nP (4) n−1 − 2κ(1 +n) × (n − 1)P (14) n − (n + 1)P (14) n+1 + 2P (12) n − 2κnn × P (14) n − P (14) n−1 −γ (14) 14 P (14) n , P (15) n = 2iδP (16) n + ig (n + 1)P (5) n − (n + 2)P (9) n − 2κ(1 +n)(1 + n) P (15) n − P (15) n+1 − 2κn × (n + 2)P (15) n − nP (15) n−1 − 2P (11) n −γ (15) 15 P (15) n , P (16) n = 2iδP (15) n + ig (n + 1)P (6) n+1 − (n + 2)P (10) n − 2κ(1 +n)(1 + n) P (16) n − P (16) n+1 − 2κn × (n + 2)P (16) n − nP (16) n−1 − 2P (12) n −γ 31 , ρ (6) = ρ 13 b † +bρ 31 , ρ (7) = b † ρ 13 −ρ 31 b, ρ (8) = b † ρ 13 +ρ 31 b, ρ (9) = ρ 21 b † − bρ 12 , ρ (10) = ρ 21 b † + bρ 12 , ρ (11) = b † ρ 23 b † + bρ 32 b, ρ (12) = b † ρ 23 b † − bρ 32 b, ρ (13) = b †2 ρ 23 + ρ 32 b 2 , ρ (14) = b †2 ρ 23 − ρ 32 b 2 , ρ (15) = ρ 23 b †2 + b 2 ρ 32 , ρ (16) = ρ 23 b †2 − b 2 ρ 32 , using the Master Equation (A1) and then projecting them on the Fock states |n , i.e., P (i) n = n|ρ (i) |n , {i ∈ 0 · · · 16}, and n ∈ {0, ∞}. Together with Exps.…”

Nonlinear optical rectification and optical bistability in a coupled asymmetric quantum dot-metal nanoparticle hybrid

“…Asymmetric quantum systems, such as asymmetric QDs, give rise to permanent electric dipole moments (PDMs) which also interact with light and modify significantly their optical response. Some of the phenomena that have been studied in quantum systems with PDMs include second harmonic generation 45 and high-order harmonic generation, 46 two-photon phase conjugation by degenerate fourwave mixing, 47 terahertz emission, 48,49 modifications of the saturation of absorption, dispersion, and nonlinear optical rectification, 50 and generation of correlated photon pairs, 51 as well as modified population inversion, absorption, emission, dispersion, and resonance fluorescence in bichromatically driven quantum systems with PDMs. [52][53][54][55] In this paper, we emphasize on the phenomena of nonlinear optical rectification, which is the simplest second-order nonlinear phenomenon, and controlled optical bistability.…”