Fig. 4: Selection of the photon readout basis.
From: Deterministic spin-photon entanglement from a trapped ion in a fiber Fabry–Perot cavity
a Characterisation of the photon detection setup using a reference laser as shown in Fig. 1. The normalized count rate of reflected photons on the V-detector for different waveplate angles is shown (top). Fit of the data assuming the fiber to be an arbitrary polarization element (bottom). b Calculated correlation heat-map for different atomic qubit basis using fiber parameters determined from the fit in a). The optimal waveplate settings of the photon readout basis σi used for the measurements in Fig. 2 are labeled accordingly with lower indices Hi/Vi; i ∈ (x, y, z).
