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We demonstrate low-excitation transport and separation of two-ion crystalsconsisting of one beryllium and one calcium ion, with a high mass ratio of$4.4$. The full separation involves transport of the mixed-species chain,splitting each ion into separate potential wells, and then transport of eachion prior to detection. We find the high mass ratio makes the protocolsensitive to mode crossings between axial and radial modes, as well as touncontrolled radial electric fields that induce mass-dependent twists of theion chain. By controlling these stages, we achieve excitation as low as$\bar{n}=1.40 \pm 0.08$ phonons for the calcium ion and $\bar{n}=1.44 \pm 0.09$phonons for the beryllium ion. Separation and transport of mixed-species chainsare key elements of the QCCD architecture, and may also be applicable toquantum-logic-based spectroscopy of exotic species.

Low-excitation transport and separation of high-mass-ratio mixed-species ion chains