Scaling up semiconductor quantum dot (QD)-based qubits into large arrays will depend on efficient, reliable methods to select gate voltages that place each dot in the correct operating regime. QDs are inherently dynamic systems with the confinement of electrons within QDs and the electron tunneling to and from a QD being sensitive to changes in gate voltages. This dynamical nature manifests through fluctuations in charge states and quantum coherence, requiring near-continuous monitoring and adjustment. In practice, the choice of the voltages confine electrons not only within QDs but also beneath reservoirs and inside nearby auxiliary devices, such as single-electron transistor charge sensors (SETs). Every decision is part of a multi-faceted, time-consuming approach to tuning the system's parameters to form qubits. A key challenge for this platform is ensuring scalable tune-ability while reducing manual control efforts. I will present a modular, autonomous tuning system that bootstraps and calibrates QD devices, with specialized sub-systems designed for each step of the tuning process. Additionally, I will outline a future vision where such tuning software accelerates device calibration, automating away further complications in a community-driven, platform-agnostic manner.
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Publication: J. P. Zwolak and J. M. Taylor. Colloquium: Advances in automation of quantum dot devices control. Rev. Mod. Phys. 95, 011006 (2023).<br>J. P. Zwolak et al. Auto-tuning of double dot devices it in situ with machine learning. Phys. Rev. Applied 13, 034075 (2020).<br>J. Ziegler et al. Toward Robust Autotuning of Noisy Quantum dot Devices. Phys. Rev. Applied 17, 024069 (2022).<br>J. Ziegler et al. Tuning arrays with rays: Physics-informed tuning of quantum dot charge states. Phys. Rev. Applied 20, 034067 (2023).<br>A. Rao et al. Automated real-time gate virtualization of a 10 quantum dot array (in preparation).
Presenters
Justyna P Zwolak
National Institute of Standards and Technology (NIST)
Authors
Justyna P Zwolak
National Institute of Standards and Technology (NIST)
