Towards autonomous qubit initialization in gate defined quantum dots
J. Darulová1, N. Wiebe2, C.E. Granade2, S. J. Pauka3, X.G. Croot3, A. Mahoney3, C.M. Marcus4, M.C. Cassidy5, D. J. Reilly 3,5, M. Troyer1,2
1Institute for Theoretical Physics, ETH Zurich, Switzerland
2Quantum Architectures and Computation Group, Microsoft Research, USA
3School of Physics, The University of Sydney, Australia
4Center for Quantum Devices and Microsoft Corporation Copenhagen, Denmark
5Microsoft Corporation, Sydney, Australia.
Defining quantum dots in semiconductor or semiconductor/superconductor heterostructures is an essential step in initializing solid-state qubits. To date, the majority of the repetitive task of finding suitable gate voltages defining a quantum dot is done by hand. However, as the complexity of devices as well as the number of devices per chip grows, this approach becomes unfeasible.
Existing attempts to automate this process focuses on specific stages of the tune up [1, 2, 3] and require significant input from the experimentalist.
Here we present an approach in which no user input is needed in order to characterize an unknown sample and tune it into its operational regime. We discuss challenges, advantages and further steps needed to implement a fully autonomous software capable of controlling a solid-state qubit device from cooldown to qubit manipulations.
[1] S.S. Kalantre et al. external page arXiv:1712.04914 (2017)
[2] T.A. Baart et al. Appl. Phys. Lett. 108, 213104 (2016)
[3] C.J van Diepen et al. external page arXiv:1803.10352 (2018)