Subspace Leakage Error Randomized Benchmarking of Mølmer-Sørensen Gates

• URL: http://arxiv.org/abs/2510.09508v1
• Date: Fri, 10 Oct 2025 16:11:26 GMT
• Title: Subspace Leakage Error Randomized Benchmarking of Mølmer-Sørensen Gates
• Authors: R. T. Sutherland, A. C. Hughes, J. P. Marceaux, H. M. Knaack, C. M. Löschnauer, R. Srinivas,
• Abstract summary: We demonstrate a new technique that adapts single-qubit randomized benchmarking to two-qubit Molmer-Sorensen gates.<n>We use the controllable gate phase to generate Cliffords that act on a two-state subspace, enabling benchmarking of two-qubit gates without single-qubit operations.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We demonstrate a new technique that adapts single-qubit randomized benchmarking to two-qubit M{\o}lmer-S{\o}rensen gates. We use the controllable gate phase to generate Cliffords that act on a two-state subspace, enabling benchmarking of two-qubit gates without single-qubit operations. In addition to quantifying the gate infidelity, the protocol provides valuable information about the type of error by distinguishing between those that conserve the two-state subspace and those that result in leakage out of it. We demonstrate the protocol for calibrating and validating all-electronic maximally entangling gates in a trapped-ion quantum computer, achieving a two-qubit gate error of $2.6 (2)\times10^{-4}$.

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