Benchmarking a high-fidelity mixed-species entangling gate

• URL: http://arxiv.org/abs/2004.08162v2
• Date: Mon, 3 Aug 2020 12:03:23 GMT
• Title: Benchmarking a high-fidelity mixed-species entangling gate
• Authors: A. C. Hughes, V. M. Sch\"afer, K. Thirumalai, D. P. Nadlinger, S. R. Woodrow, D. M. Lucas and C. J. Ballance
• Abstract summary: We implement a two-qubit logic gate between a $43mathrmCa+,$ hyperfine qubit and a $88mathrmSr+,$ Zeeman qubit. For this pair of ion species, the S--P optical transitions are close enough that a single laser wavelength of $402,mathrmnm$ can be used to drive the gate.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We implement a two-qubit logic gate between a $^{43}\mathrm{Ca}^+\,$ hyperfine qubit and a $^{88}\mathrm{Sr}^+\,$ Zeeman qubit. For this pair of ion species, the S--P optical transitions are close enough that a single laser of wavelength $402\,\mathrm{nm}$ can be used to drive the gate, but sufficiently well separated to give good spectral isolation and low photon scattering errors. We characterize the gate by full randomized benchmarking, gate set tomography and Bell state analysis. The latter method gives a fidelity of $99.8(1)\%$, comparable to that of the best same-species gates and consistent with known sources of error.

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