Kavli Affiliate: Giordano Scappucci
| First 5 Authors: Alberto Tosato, Alberto Tosato, , ,
| Summary:
Large-scale integration of semiconductor spin qubits into quantum processors
hinges on the ability to characterize quantum components at scale, a task
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.
The crossbar features tightly-pitched spin qubit tiles and is implemented in
planar germanium, by fabricating a large device with the potential to host 1058
hole spin qubits. Measurements on a patch of 40 tiles demonstrate key device
functionality at millikelvin temperatures, including tile addressability,
threshold voltage and charge noise statistics, and the 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.
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