Optimal Control of the Operating Regime of a Single Electron Double Quantum Dot

TL;DR

This paper demonstrates that optimal control pulses designed with the GRAPE algorithm can improve the fidelity of operating regime transfers in a double quantum dot device, enhancing its utility for quantum computing applications.

Contribution

It introduces the application of the GRAPE algorithm to optimize control pulses for a double quantum dot, surpassing linear methods in fidelity.

Findings

GRAPE-generated pulses achieve higher fidelity transfers.

Optimal control enhances device performance for quantum operations.

Method improves coherence and susceptibility control in quantum dots.

Abstract

The double quantum dot device benefits from the advantages of both the spin and charge qubits, while offering ways to mitigate their drawbacks. Careful gate voltage modulation can grant greater spinlike or chargelike dynamics to the device, yielding long coherence times with the former and high electrical susceptibility with the latter for electrically driven spin rotations or coherent interactions with microwave photons. We show that optimal control pulses generated using the GRadient Ascent Pulse Engineering (GRAPE) algorithm can yield higher-fidelity operating regime transfers than can be achieved using linear methods.