Speaker
Description
Entangling operations on trapped-ion processors are typically mediated by the motional states of a linear string of ions. This is achieved by coupling the electronic qubit subspace of ions with the bosonic phonon subspace of quantised normal mode oscillations of the entire ion string. Typically, the common mode, defined by all ions participating equally and oscillating in phase, is used. This is motivated by the structure of the resulting unitary having favourable scaling properties when used as part of a universal gate set for quantum computing. However, the common mode famously heats the most under electric field noise, which causes deleterious decoherence effects and significantly reduces the resulting gate fidelity. Furthermore, for large ion strings, individual mode addressing without incurring parasitic phase contributions from the other modes is typically infeasible without various compensation methods to mitigate these errors. Here, we present an alternative method that uses mode-engineering and multitone driving to resolve both of these problems, in order to achieve an equivalent unitary whilst minimising the use of the common mode. We demonstrate the viability of this method by presenting an example solution for the case of N = 10 ions.
| Academic level | Master's Student |
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