Abstract
We propose and theoretically analyze a new scheme for generating hyper-entangled photon pairs (EPPs) in a system of polaritons in coupled planar microcavities. Starting from a microscopic model, we evaluate the relevant parametric scattering processes and numerically simulate the phonon-induced noise background under continuous-wave excitation. Our results show that, compared to other polariton entanglement proposals, our scheme enables the generation of photon pairs that are entangled in both the path and polarization degrees of freedom, and simultaneously leads to a strong reduction in the photoluminescence noise background. This can significantly improve the fidelity of the EPPs under realistic experimental conditions.
Highlights
The generation of entangled photon pairs (EPPs) using similar processes in microcavity polariton systems [3, 4] has been the subject of intensive research [5,6,7,8,9,10]
In polariton systems the fidelity of the EPPs is affected by phonon-induced scattering processes and Rayleigh scattering from the pump beams
To quantify the amount of entanglement in the present coupled cavity setup, we study the competition between parametric coherent scattering and the incoherent PL background
Summary
Half photon, polaritons benefit from strong Coulomb interactions, while they can be converted into propagating optical qubits for long-distance entanglement distribution. This could be used to build sources with very high EPP generation rates (GRs). We consider a system of three planar microcavities [7], which are coupled via two shared Bragg mirrors as illustrated in figure 1(a) In this setup the splitting of the upper and lower polariton dispersion curves into three wellseparated sub-branches provides an additional flexibility for engineering parametric interbranch scattering processes [13, 16], which leads to qualitative new features and an improved performance of the EPP creation.
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