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Description
Single-qubit rotations and a two-qubit entangling gate form a universal set of quantum logic gates[1]. In this work, we realize such a two-qubit computational register that is compatible with the quantum charge-coupled device (QCCD) architecture. Quantum logic operations are implemented using embedded microwave conductors. Single-qubit gates in two-ion crystals are performed by addressing each ion individually with a micromotion addressing technique[2]. The single-qubit gate infidelity of individually addressed ion is characterized using a randomized benchmark protocol of $3.8(4)\times 10^{-3}$. The entanglement operation is implemented using a Mølmer-Sørensen type interaction, where we measure an infidelity approaching $10^{-3}$ using partial state tomography[3]. Finally, we characterize the quantum processor in a computational context using the cycle benchmarking protocol[4]. We present a partial analysis of the discrepancy of the above results.
[1] M. Bremner et al., Phys. Rev. Lett. 89, 247902 (2002)
[2] U. Warring et al., Phys. Rev. Lett. 17, 173002 (2013)
[3] M. Duwe et al., Quantum Sci. Technol. 7, 045005 (2022)
[4] A. Erhard et al., Nat. Commun. 10, 5347 (2019)
