Protected & Unconventional Superconducting Qubits

8:00 am – 11:00 am, Wednesday March 19 // Session MAR-L18 //Anaheim Convention Center, 162 (Level 1)

Chair:: Xinyuan You, Fermi National Accelerator Laboratory (Fermilab)
Topics:
Sponsored by: DQI

Dynamical Sweet Spot Manifolds of Bichromatically Driven Floquet Qubits

10:36 am – 10:48 am

Presenter: D. Dominic Dominic Briseno-Colunga (Chapman University)

Authors: Bibek Bhandari (Chapman University), Debmalya Das (University of Bari), Yosep Kim (Korea Institute of Science and Technology), Long Nguyen (University of California, Berkeley), David Santiago (Lawrence Berkeley National Laboratory), Irfan Siddiqi (University of California, Berkeley), Justin Dressel (Chapman University), Andrew Jordan (Chapman University)

Flux-tunable superconducting circuits are vulnerable to noise induced dephasing except at sparse flux bias sweet-spots, limiting the utility of the flux control. Replacing the DC flux bias with an AC signal reveals continuous manifolds of noise protected dynamical sweet spots, allowing for flux modulation while limiting dephasing. Here, we utilize Floquet theory to analyze the dynamical sweet spots induced by weak and strong bichromatic flux drives. Specifically, we characterize the Floquet quasienergy spectrum, multiphoton resonance (AC stark shift and power broadening), and dephasing lifetime for a two level system as functions of the driving frequencies and AC amplitudes. We obtain a maximal dephasing lifetime when both driving strengths are non-negligible, suggesting a better lifetime with bichromatic driving compared to the monochromatic case.

PRESENTATIONS (15)