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The work targets a practical bottleneck in superconducting quantum processors: unwanted qubit excitations from classical microwave drive lines. The preprint reports a single-chip test showing that the crosstalk null can sit about 300 MHz from the conventional Jeff = 0 point, so standard coupler-tuning heuristics may not minimize drive crosstalk. For quantum hardware engineers, the result matters mainly as a design rule for floating-transmon layouts, though it still needs validation across larger multi-qubit devices.
Chalmers University Demonstrates Hardware-Level Microwave Crosstalk Suppression via Parasitic Capacitance Engineering
Physicists at Chalmers University of Technology have developed a new method to eliminate microwave crosstalk in superconducting processors. Their research shows that by engineering on-chip parasitic capacitances, they can achieve destructive interference among parasitic capacitive channels, suppressing unwanted qubit excitations. This method offers a practical advantage for floating transmons and allows for alignment of classical microwave crosstalk nulls with quantum ZZ nulls. The post Chalmers University Demonstrates Hardware-Level Microwave Crosstalk Suppression via Parasitic Capacitance Engineering appeared first on Quantum Computing Report.
Circuit schematic of two floating transmon qubits, Q1 and Q2, capacitively coupled to a grounded flux-tunable coupler through C1c and C2c, with direct qubit–qubit coupling through C12. Physicists at Chalmers University of Technology have demonstrated an architectural layout method to eliminate classical microwave drive crosstalk in superconducting processors by engineering on-chip…
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