Extended Data Fig. 1: Polarization characteristics of the QD and micropillar cavity investigated in this study.
From: Quantum correlations of spontaneous two-photon emission from a quantum dot
(a) Polarization-resolved spectra of the cQED system under CW above-band excitation. Under above-band excitation, X and XX are not equally populated and the non-resonant coupling effect is more pronounced than that of the resonant excitation used in the maintext. (b) Polarization dependence of the energy difference between X and XX, from which a fine-structure splitting (FSS) of 8.1 μeV is extracted. (c) Polarization dependence of the energy shift of the cavity mode, showing a cavity splitting of 3.4 μeV between horizontally (H) and vertically (V) polarized modes. The angle between the main polarization axes of the QD and the cavity is 0.23°. (d) The reflection spectrum of the cavity in H-polarization. The data is fitted with a Lorentzian function, leading to a FWHM of 0.0338 nm corresponding to a Q-factor of 26,911(5).
