Coherent population transfer between weakly-coupled states in a ladder-type superconducting qutrit

  1. H. K. Xu,
  2. W. Y. Liu,
  3. G. M. Xue,
  4. F. F. Su,
  5. H. Deng,
  6. Ye Tian,
  7. D. N. Zheng,
  8. Siyuan Han,
  9. Y. P. Zhong,
  10. H. Wang,
  11. Yu-Xi Liu,
  12. and S. P. Zhao
Stimulated Raman adiabatic passage (STIRAP) offers significant advantages for coherent population transfer between un- or weakly-coupled states and has the potential of realizing efficient quantum gate, qubit entanglement, and quantum information transfer. Here we report on the realization of STIRAP in a superconducting phase qutrit – a ladder-type system in which the ground state population is coherently transferred to the second-excited state via the dark state subspace. The result agrees well with the numerical simulation of the master equation, which further demonstrates that with the state-of-the-art superconducting qutrits the transfer efficiency readily exceeds 99% while keeping the population in the first-excited state below 1%. We show that population transfer via STIRAP is significantly more robust against variations of the experimental parameters compared to that via the conventional resonant π pulse method. Our work opens up a new venue for exploring STIRAP for quantum information processing using the superconducting artificial atoms.
arxiv pdf

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