Engineering, control and longitudinal readout of Floquet qubits
Abstract
Properties of time-periodic Hamiltonians can be exploited to increase the dephasing time of qubits and to design protected one and two-qubit gates. Recently, Huang et al. [Phys. Rev. Applied 15, 034065 (2021)] have shown that time-dependent Floquet states offer a manifold of working points with dynamical protection larger than the few usual static sweet spots. Here, we use the framework of many-mode Floquet theory to describe approaches to robustly control Floquet qubits in the presence of multiple drive tones. Following the same approach, we introduce a longitudinal readout protocol to measure the Floquet qubit without the need of first adiabatically mapping back the Floquet states to the static qubit states, which results in a significant speedup in the measurement time of the Floquet qubit. The analytical approach developed here can be applied to any Hamiltonian involving a small number of distinct drive tones, typically the study of standard parametric gates for qubits outside of the rotating-wave approximation.
Cite
@article{arxiv.2108.11260,
title = {Engineering, control and longitudinal readout of Floquet qubits},
author = {Anthony Gandon and Camille Le Calonnec and Ross Shillito and Alexandru Petrescu and Alexandre Blais},
journal= {arXiv preprint arXiv:2108.11260},
year = {2023}
}
Comments
10 pages, 6 figures