Line Plot from Scientific Research

Measured qubit spectrum for various prepared Fock states |N>, with N = 30, 50, 70 and 100. The frequency detuning on the bottom horizontal axis is the drive frequency relative to the qubit frequency in the absence of any photons in the cavity. The solid lines are fits to a sum of Gaussian functions to extract the Fock state populations Pn. The total numbers of measurements (the numbers of post-selected measurements) are approximately 4 x 10^4 (2.2 x 10^3), 5.5 x 10^4 (2.2 x 10^3), 7.9 x 10^4 (2.5 x 10^3) and 1.0 x 10^6 (2.1 x 10^3) with N = 30, 50, 70 and 100, respectively.

DOI