Quantum control of a model qubit based on a multi-layered quantum dot

TL;DR

This paper demonstrates a model qubit based on a multi-layered quantum dot with robust and efficient control using simple sinusoidal driving, achieving high-quality Rabi oscillations and low leakage.

Contribution

It introduces a novel quantum dot design for qubits that exhibit excellent dynamical properties and robustness under simple control schemes.

Findings

High-quality Rabi oscillations achieved with sinusoidal driving

Low leakage during state switching, even off-resonance

Robust quantum control under perturbations

Abstract

In this work we present a model qubit whose basis states are eigenstates of a multi-layered quantum dot. We show that the proper design of the quantum dot results in qubit states that have excellent dynamical properties when a time-dependent driving is applied to it. In particular, it is shown that a simple sinusoidal driving is sufficient to obtain good quality Rabi oscillations between the qubit states. Moreover, the switching between states can be performed with very low leakage, even under off-resonance conditions. In this sense, the quantum control of the qubit is robust under some perturbations and achieved with simple means.