Extending the qubit coherence times is a crucial task in building quantum information processing devices. In the three-dimensional cavity implementations of circuit QED, the coherence of superconducting qubits was improved dramatically due to cutting the losses associated with the photon emission. Next frontier in improving the coherence includes the mitigation of the adverse effects of superconducting quasiparticles. In these lectures, we review the basics of the quasiparticles dynamics, their interaction with the qubit degree of freedom, their contribution to the qubit relaxation rates, and approaches to control their effect.
@article{arxiv.2003.04366,
title = {Bogoliubov Quasiparticles in Superconducting Qubits},
author = {Leonid I. Glazman and Gianluigi Catelani},
journal= {arXiv preprint arXiv:2003.04366},
year = {2021}
}
Comments
42 pages, 14 figures. Submitted to SciPost Lecture Notes. To appear in 'Quantum Information Machines; Lecture Notes of the Les Houches Summer School 2019', eds. M. Devoret, B. Huard, and I. Pop