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Wires above qubits see UNSW researchers take quantum control step.
Wires above qubits see UNSW researchers take quantum control step.
Scientists at the University of New South Wales (UNSW) have devised a new placement of control wiring that they hope will scale up to controlling millions of qubits.
In research published in Science Advances, the team said they wanted control, but without having precious space taken up by wiring that used increasing amounts of electricity and generated heat that needed to be dissipated.
"Up until this point, controlling electron spin qubits relied on us delivering microwave magnetic fields by putting a current through a wire right beside the qubit," UNSW quantum engineer Dr Jarryd Pla said.
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"First off, the magnetic fields drop off really quickly with distance, so we can only control those qubits closest to the wire.
That means we would need to add more and more wires as we brought in more and more qubits, which would take up a lot of real estate on the chip."
With the experiments being completed at temperatures of 50 millikelvins, a touch under -273 Celsius, the heat from the wires could interfere with qubit reliability.
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