IEEE Transactions on Quantum Engineering (Jan 2023)

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

  • V. Reiher,
  • Y. Berube-Lauziere

DOI
https://doi.org/10.1109/TQE.2023.3324841
Journal volume & issue
Vol. 4
pp. 1 – 10

Abstract

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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. As this architecture is a serious contender for the realization of a versatile physical qubit, improving its control is a critical step toward building a large-scale spin-based universal quantum computer. We show that optimal control pulses generated using the gradient ascent pulse engineering algorithm can yield higher fidelity operating regime transfers than can be achieved using linear methods.

Keywords