Towards excited state control and readout of quantum dot spin qubits via THz radiation

Semiconductor spin qubits are a leading quantum computing technology with single and two-qubit gate fidelities exceeding the fault-tolerant threshold [1-3]. However, extending proof-of-principle devices to large scale quantum processors will likely require new approaches to control and readout. Here, we propose the use of spin-selective orbital transitions driven by coherent terahertz radiation to enable new approaches to both quantum control and readout. In this talk, we describe our experiment setup, which includes an optical dilution refrigerator equipped with a THz source. We will outline the physical mechanisms for control and readout and share preliminary data.

[1] Xue et al., Nature. 601, 343 (2022)

[2] Noiri et al., Nature. 601, 338 (2022)

[3] Mills et al., Sci. Adv. 8, eabn5130 (2022)