Kavli Affiliate: Giordano Scappucci
| First 5 Authors: Alberto Tosato, Asser Elsayed, Federico Poggiali, Lucas Stehouwer, Davide Costa
| Summary:
Large-scale integration of semiconductor spin qubits into industrial quantum
processors hinges on the ability to characterize the performance of quantum
components at scale. While the semiconductor industry has addressed scalable
testing for transistors using device matrix arrays, extending this approach to
quantum dot spin qubits is challenged by their operation at sub-kelvin
temperatures, in the presence of magnetic fields, and by the use of
radio-frequency signals. Here, we present QARPET (Qubit-Array Research Platform
for Engineering and Testing), a scalable architecture for characterizing spin
qubits using a quantum dot crossbar array with sublinear scaling of
interconnects. The crossbar features tightly pitched (1 {mu}m), individually
addressable spin qubit tiles and is implemented in planar germanium, by
fabricating a large device with the potential to host 1058 hole spin qubits. We
focus our measurements on a patch of 40 tiles and demonstrate key device
functionality at millikelvin temperature including unique tile addressability,
threshold voltage and charge noise statistics, and characterisation of hole
spin qubits and their coherence times in a single tile. These demonstrations
pave the way for a new generation of quantum devices designed for the
statistical characterisation of spin qubits and for developing automated
routines for quantum dot tuning and spin qubit operation.
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