论文标题
基准高保真混合物种纠缠的门
Benchmarking a high-fidelity mixed-species entangling gate
论文作者
论文摘要
我们在$^{43} \ mathrm {Ca}^+\，$ hyperfine Qubit和$^{88} \ Mathrm {sr}^+\，$ zeeman Qubit之间实现了一个两倍的逻辑门。对于这对离子物种，S-P光学转变足够接近，以使波长$ 402 \，\ Mathrm {nm} $的单个激光器可用于驱动门，但足够良好的分离以提供良好的光谱隔离和低光子散射。我们通过完整的随机基准测试，门设置断层扫描和钟状态分析来表征门。后一种方法给出了$ 99.8（1）\％$的保真度，可与最佳的同种物种大门相当，并且与已知的错误来源一致。
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 transitions are close enough that a single laser of wavelength $402\,\mathrm{nm}$ can be used to drive the gate, but sufficiently well separated to give good spectral isolation and low photon scattering errors. We characterize the gate by full randomized benchmarking, gate set tomography and Bell state analysis. The latter method gives a fidelity of $99.8(1)\%$, comparable to that of the best same-species gates and consistent with known sources of error.
