Benchmarking a high-fidelity mixed-species entangling gate

A. C. Hughes, V. M. Schäfer, K. Thirumalai +4

We implement a two-qubit logic gate between a ${}^{43}{\mathrm{Ca}}^{+}$ hyperfine qubit and a ${}^{88}{\mathrm{Sr}}^{+}$ Zeeman qubit. For this pair of ion species, the S--P optical trans…