Optimal superadiabatic population transfer and gates by dynamical phase corrections

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Original languageEnglish
Article number024006
JournalQuantum Science and Technology
Volume3
Issue number2
Publication statusPublished - 1 Apr 2018
MoE publication typeA1 Journal article-refereed

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Abstract

In many quantum technologies adiabatic processes are used for coherent quantum state operations, offering inherent robustness to errors in the control parameters. The main limitation is the long operation time resulting from the requirement of adiabaticity. The superadiabatic method allows for faster operation, by applying counterdiabatic driving that corrects for excitations resulting from the violation of the adiabatic condition. In this article we show how to construct the counterdiabatic Hamiltonian in a system with forbidden transitions by using two-photon processes and how to correct for the resulting time-dependent ac-Stark shifts in order to enable population transfer with unit fidelity. We further demonstrate that superadiabatic stimulated Raman passage can realize a robust unitary NOT-gate between the ground state and the second excited state of a three-level system. The results can be readily applied to a three-level transmon with the ladder energy level structure.

    Research areas

  • adiabatic gates, quantum gates, shortcuts to adiabaticity, STIRAP

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