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

Abstract

We demonstrate low-excitation transport and separation of two-ion crystals consisting 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 each ion prior to detection. We find the high mass ratio makes the protocol sensitive to mode crossings between axial and radial modes, as well as to uncontrolled radial electric fields that induce mass-dependent twists of the ion 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 chains are key elements of the QCCD architecture, and may also be applicable to quantum-logic-based spectroscopy of exotic species.

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Cited by in corpus (5)

• Multi-zone trapped-ion qubit control in an integrated photonics QCCD device
• A Comparison of Calcium Sources for Ion-Trap Loading via Laser Ablation
• Fast mixed-species quantum logic gates for trapped-ion quantum networks
• Fast Ground State to Ground State Separation of Small Ion Crystals
• Numerically Optimizing Shortcuts to Adiabaticity: A Hybrid Control Strategy