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arXiv:1508.01849 · Nature Communications

Coherent population transfer between uncoupled or weakly coupled states in ladder-type superconducting qutrits

Huikai Xu, Chao Song, W. Y. Liu, Guangming Xue, Feifan Su, H. Deng, Ye Tian, Dongning Zheng, Siyuan Han, Youpeng Zhong, H. Wang, Yu-xi Liu, S. P. Zhao

Published Mar 24, 2016• 83 citations

Abstract

Stimulated Raman adiabatic passage offers significant advantages for coherent population transfer between uncoupled 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 the process in the superconducting Xmon and phase qutrits--two ladder-type three-level systems in which the ground state population is coherently transferred to the second excited state via the dark state subspace. We demonstrate that the population transfer efficiency is no less than 96% and 67% for the two devices, which agree well with the numerical simulation of the master equation. Population transfer via stimulated Raman adiabatic passage is significantly more robust against variations of the experimental parameters compared with that via the conventional resonant π pulse method. Our work opens up a new venue for exploring the process for quantum information processing using the superconducting artificial atoms.

DOI: 10.1038/ncomms11018

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Adiabatic manipulation of the quantum state is an essential tool in modern quantum information processing. Here, we demonstrate the speedup of the adiabatic population transfer in a three-level superconducting transmon circuit by suppressing the spurious nonadiabatic excitations with an additional two-photon microwave pulse. We apply this superadiabatic method to the stimulated Raman adiabatic passage, realizing fast and robust population transfer from the ground state to the second excited state of the quantum circuit.

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