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Honeywell just published a paper describing a paper in Nature describing a proposal for a quantum computer that uses mobile ions as qubits, which can be read here: https://www.nature.com/articles/s41586-021-03318-4

The aptly dubbed “Trapped-Ion Quantum Charge-Coupled Device (QCCD)” is proposed to be able to maintain the low error rates that have been shown in small trapped-ion experiments, working on timescales that are fast relative to the coherence times of the qubits.

The QCCD works by storing quantum information in the internal state of electrically charged ions, which are transported between different processing zones using dynamic electric fields.

Although there are barriers to scaling this architecture due to the hardship of performing the involved operations with low error, they state that they were able to achieve a negligible crosstalk error with a quantum volume of 26 = 64.

These results demonstrate that the QCCD architecture provides a viable path towards high-performance quantum computers.

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