Coherent control of \(^{171}\mathrm{Yb}^{+}\) ion qubit states and thermometry using motional decoherence


\(^{171} \mathrm{Yb}^{+}\)ions were trapped in a quadrupole ion trap. A mode-locked pulse laser at 355 nm was used to generate a frequency comb to drive a Raman transition between the ground hyperfine qubit states of the Doppler cooled ion. Qubit transitions were driven in co-propagating and counter propagating laser beam geometries. In the co-propagating geometry, the coherence time and the fidelity of gate operations were obtained. By taking advantage of the phonon number sensitivity of the Rabi frequency in the counter-propagating geometry, we measured the center of mass temperature of the trapped ion near the Doppler limit which can be used for general thermometry in the ion trap experiment.

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This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea Government (MSIP) (no. 2016R1A3B1908660).

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Correspondence to Dahyun Yum or Wonho Jhe.

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Jeon, H., Park, N., Yu, J. et al. Coherent control of \(^{171}\mathrm{Yb}^{+}\) ion qubit states and thermometry using motional decoherence. J. Korean Phys. Soc. 78, 251–258 (2021).

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  • Trapped ion
  • Raman transition
  • Hyperfine qubit
  • Thermometry
  • Quantum information
  • Quantum computation