A shared microwave line controls parallel quantum gates in a new test
A wiring experiment separates measured performance from a larger system proposal.
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A new preprint tests a way to reduce the wiring needed to control superconducting quantum processors. The approach sends several microwave frequencies through shared infrastructure, then uses filters to direct them to the intended operations.[1]
In a one-to-four multiplexing demonstration, the researchers report average parallel gate errors of 0.64 ± 0.02 percent for and 0.106 ± 0.002 percent for single- pi-over-two rotations.[1]
Within the experiment's statistical resolution, multiplexing did not produce a significant error increase relative to dedicated-channel controls.[1]
The broader wiring reductions are projections. Using the demonstrated gate parameters, the proposed architecture estimates control-line needs at one-twelfth of an unmultiplexed baseline. A one-forty-eighth estimate requires additional idealized assumptions. Neither ratio was demonstrated across a large working processor.[1]
Submitted October 26, the paper addresses a practical scaling constraint: getting control signals into a refrigerator without overwhelming space and cooling budgets. It does not establish a million-qubit machine or measured whole-system heat savings.[1]