Fig. 2: Dynamic routing of quantum dot emission.
From: On-chip generation and dynamic piezo-optomechanical rotation of single photons
a Schematic representation of the experimental configuration: although the optical transition of a single QD in Input WG-A is not modulated (IDTSM is inactive), the response of the MZI is modulated (IDTPM is active) as the photons pass through. Emission is collected by a lensed fiber from either Output WG-A (red) or Output WG-B (black). b Phase-integrated emission spectra of the same single QD measured without a SAW (top panels, IDTPM off) and an applied SAW (Prf,PM = 23 dBm, lower panels). c Measured SAW phase-dependent intensity of the main QD emission line (λ0 in b) detected via Output WG-A (red symbols) and Output WG-B (black symbols) for different Prf,PM as defined by Eq. (6) and Eq. (7). The simulation results (solid lines) for phase modulation amplitudes Δϕ = 0.3, 0.5, 0.8 and 1.3 rad are also shown for both outputs. The upper panel shows the time-resolved SAW-induced optical phase shift ϕA/B in the upper (WG-B, solid line) and lower arms (WG-A, dashed line) of the MZI. The right-hand side panel shows the 〈SZ〉-projection of the qubit for the measurement and the corresponding simulation given by Eq. (8) The scale bar in the upper right panel shows the 300 ps timing jitter of the used single photon detector. d–f Rotations of the qubit states in the equatorial plane of the Bloch sphere at three distinct phases during the acoustic cycle given by Eq. (2) and Eq. (3). Symbols mark these phases in the projection data in (c).
