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Discrimination and estimation for dephasing sources of trapped ion qubits

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Abstract

In this paper, we propose a handy method to discriminate and estimate the dephasing noise sources of trapped ion qubits, which are mainly magnetic field noise and laser frequency noise. In our method, the conventional Ramsey experiment is used to measure the dephasing time \(T_2^*\) and calculate the total linewidth of dephasing noise. Transitions with different magnetic field sensitivities and error propagation theory are employed to quantitatively estimate the linewidth of each noise. We experimentally demonstrated this method by taking advantage of five magnetically sensitive transitions of single trapped \(^{40}\)Ca\(^+\), and the linewidth of the laser frequency noise and magnetic field noise is determined to be 493.3 ± 8.1 Hz and 181.4 ± 3.5 \(\upmu \)G, respectively, in our system. This method also can be used to separate magnetic field noise and other dephasing noise in other atomic system such as neutral atoms.

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Acknowledgements

This work is supported by the National Basic Research Program of China (Grant No. 2016YFA0301903), the National Natural Science Foundation of China (Grant Nos. 11174370, 11304387, 61632021, 11305262, and 11574398), and the Research Plan Project of National University of Defense Technology (Grant No. ZK16-03-04).

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  1. These authors contribute equally to this paper.

Authors and Affiliations

  1. Department of Physics, College of Liberal Arts and Sciences, National University of Defense Technology, Changsha, 410073, People’s Republic of China

    Jie Zhang, Wei Wu, Chun-wang Wu, Jian-guo Miao, Yi Xie, Bao-quan Ou & Ping-xing Chen

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  1. Jie Zhang
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  2. Wei Wu
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  3. Chun-wang Wu
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Correspondence to Ping-xing Chen.

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Zhang, J., Wu, W., Wu, Cw. et al. Discrimination and estimation for dephasing sources of trapped ion qubits. Appl. Phys. B 126, 20 (2020). https://doi.org/10.1007/s00340-019-7366-x

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