Fig. 4: Measured driven Zeeman shift and cavity swaps.
From: High-fidelity parametric beamsplitting with a parity-protected converter
a We measure the coupler frequency through direct spectroscopy under a single drive tone, as a function drive amplitude. Comparing the Zeeman shift for either drive tone (pink, purple) to the prediction from Floquet simulation (gray solid line) allows accurate calibration of the drive strength in terms of the driven junction phase ϕd1,2. b Measured population in Bob in the presence of both drive tones as a function of the drive-detuning (Δd − Δab) and the time of evolution. A single photon is prepared in Bob, and the drives swap this photon between Alice and Bob under the detuned beamsplitter interaction. c Fitting the oscillations as a function of drive-detuning to the Rabi model allows us to calibrate amplitude-dependent shift in the resonance condition (ΔZ,ab) and strength gBS of the beamsplitting interaction.
