High-fidelity entanglement of metastable trapped-ion qubits with integrated erasure conversion

Understand

Today's most advanced ion trap quantum computers have significant overhead due to the need for dual-species operation.

• Looking ahead, logical qubit register sizes will be limited by the encoding rate needed to correct generic Pauli errors.
• We address both of these issues by establishing high-fidelity control of metastable qubits, a key component of \textit{omg} or dual-type architectures, which enables converting a significant fraction of gate errors to erasures.
• We first implement an erasure conversion scheme which enables detection of $\sim 94\%$ of spontaneous Raman scattering errors during logic gates and nearly all errors from qubit decay.