High-fidelity, adaptive qubit measurements through repetitive information transfer

D. B. Hume, T. Rosenband, D. J. Wineland

Using two trapped ion species (${}^{27}\mathrm{A}{\mathrm{l}}^{+}$ and ${}^9\mathrm{B}{\mathrm{e}}^{+}$) as primary and ancillary systems, we implement qubit measurements based on the repetitive transfer of information…