Berlin 2024 – scientific programme

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QI: Fachverband Quanteninformation

QI 2: Semiconductor Qubits (joint session QI/HL)

QI 2.8: Talk

Monday, March 18, 2024, 12:00–12:15, HFT-FT 131

Floquet Quantum Processors — •Giovanni Francesco Diotallevi and Monica Benito — Universität Augsburg, Augsburg, Germany

Quantum dot confined hole spin qubits posses a variety of properties that render them highly attractive candidates for the development of quantum computing platforms [1]. However, using these to construct functioning large quantum processors still faces major challenges. Among these, being able to simultaneously control distant qubits with minimal cross-talk between untargetted qubits remains a goal to be achieved in the field. In this direction recent studies proposed to mediate the coupling between two distant qubits by means of superconducting quantum resonators [2].

In this research we intend to explore techniques involving external periodic drives to better control the coupling of these hole spin qubits to the interaction-mediating resonators. In particular, we envision an ensemble of periodic fields used to control the individual coupling of a series of hole spin qubits to a single resonator. Using Floquet-based theory it is indeed possible to tune the spin-orbit interaction of these qubit systems [3], thus allowing us to selectively choose which qubits to couple in order to perform desired quantum gates.

References: [1] Y. Fang et Al., *Recent advances in hole-spin qubits,* Materials for Quantum Technology, vol. 3, no. 1, p. 012003, 2023. [2] J. Dijkema et Al., *Two-qubit logic between distant spins in silicon,* 2023. [3] O. V. Kibis et Al., *Floquet engineering of the luttinger hamiltonian,* Phys. Rev. B, vol. 102, p. 035301, Jul 2020.

Keywords: Quantum Computing; Quantum-dot; Spin qubit; Floquet; Resonator