Full tunability enabled by Floquet engineering in a multilevel quantum dot system

Kavli Affiliate: Ke Wang

| First 5 Authors: Yuan Zhou, Sisi Gu, Ke Wang, Gang Cao, Xuedong Hu

| Summary:

Tunability of an artificial quantum system is crucial to its capability to
process quantum information. However, tunability usually poses significant
demand on the design and fabrication of a device. In this work, we demonstrate
that Floquet engineering based on longitudinal driving provides distinct
possibilities in enhancing the tunability of a quantum system without needing
additional resources. In particular, we study a multilevel model based on
gate-defined double quantum dots (DQDs) where the Landau-Zener-St"uckelberg
(LZS) interference could occur. We propose an effective model to describe the
LZS interference in this multilevel system, and show that it is highly tunable
via the driving field. We then illustrate the versatility and rich physics of a
driven multilevel system by exploring phenomena such as Autler-Townes Splitting
(ATS), adiabatic state transfer, and dark state. In the context of qubit
control, we propose noise-resistant quantum gates based on adiabatic passage.
The theoretical consideration we present here is rather general, and is in
principle valid for other multilevel quantum systems.

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