Spectator Errors in Tunable Coupling Architectures

Spectator Errors in Tunable Coupling Architectures

The addition of tunable couplers to superconducting quantum architectures offers significant advantages for scaling compared to fixed coupling approaches. In principle, tunable couplers allow for exact cancellation of qubit-qubit coupling through the interference of two parallel coupling pathways be...

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Hauptverfasser: Zajac, D. M, Stehlik, J, Underwood, D. L, Phung, T, Blair, J, Carnevale, S, Klaus, D, Keefe, G. A, Carniol, A, Kumph, M, Steffen, Matthias, Dial, O. E
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creator Zajac, D. M
Stehlik, J
Underwood, D. L
Phung, T
Blair, J
Carnevale, S
Klaus, D
Keefe, G. A
Carniol, A
Kumph, M
Steffen, Matthias
Dial, O. E
description The addition of tunable couplers to superconducting quantum architectures offers significant advantages for scaling compared to fixed coupling approaches. In principle, tunable couplers allow for exact cancellation of qubit-qubit coupling through the interference of two parallel coupling pathways between qubits. However, stray microwave couplings can introduce additional pathways which complicate the interference effect. Here we investigate the primary spectator induced errors of the bus below qubit (BBQ) architecture in a six qubit device. We identify the key design parameters which inhibit ideal cancellation and demonstrate that dynamic cancellation pulses can further mitigate spectator errors.
doi_str_mv 10.48550/arxiv.2108.11221
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title Spectator Errors in Tunable Coupling Architectures
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