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arXiv · 2310.15473

O(1) benchmarking of precise rotation in a spin-squeezed Bose-Einstein condensate

Peng Du·Hui Tang·Jun Zhang·Wenxian Zhang
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Abstract

Benchmarking a high-precision quantum operation is a big challenge for many quantum systems in the presence of various noises as well as control errors. Here we propose an $O(1)$ benchmarking of a dynamically corrected rotation by taking the quantum advantage of a squeezed spin state in a spin-1 Bose-Einstein condensate. Our analytical and numerical results show that tiny rotation infidelity, defined by $1-F$ with $F$ the rotation fidelity, can be calibrated in the order of $1/N^2$ by only several measurements of the rotation error for $N$ atoms in an optimally squeezed spin state. Such an $O(1)$ benchmarking is possible not only in a spin-1 BEC but also in other many-spin or many-qubit systems if a squeezed or entangled state is available.

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Peng Du, Hui Tang, Jun Zhang, Wenxian Zhang. 2023-10-24. O(1) benchmarking of precise rotation in a spin-squeezed Bose-Einstein condensate. https://doi.org/10.1103/physreva.107.053315

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