Signal Crosstalk in a Flip-Chip Quantum Processor

Sandoko Kosen; Hang Xi Li; Marcus Rommel; Robert Rehammar; Marco Caputo; Leif Grönberg; Jorge Fernández-Pendás; Anton Frisk Kockum; Janka Biznárová; Liangyu Chen; Christian KriŽan; Andreas Nylander; Amr Osman; Anita Fadavi Roudsari; Daryoush Shiri; Giovanna Tancredi; Joonas Govenius; Jonas Bylander

doi:10.1103/PRXQuantum.5.030350

Signal Crosstalk in a Flip-Chip Quantum Processor

Sandoko Kosen (Corresponding Author), Hang Xi Li, Marcus Rommel, Robert Rehammar, Marco Caputo, Leif Grönberg, Jorge Fernández-Pendás, Anton Frisk Kockum, Janka Biznárová, Liangyu Chen, Christian KriŽan, Andreas Nylander, Amr Osman, Anita Fadavi Roudsari, Daryoush Shiri, Giovanna Tancredi, Joonas Govenius, Jonas Bylander (Corresponding Author)

Chalmers University of Technology

Research output: Contribution to journal › Article › Scientific › peer-review

Abstract

Quantum processors require a signal-delivery architecture with high addressability (low crosstalk) to ensure high performance already at the scale of dozens of qubits. Signal crosstalk causes inadvertent driving of quantum gates, which will adversely affect quantum gate fidelities in scaled-up devices. Here, we demonstrate packaged flip-chip superconducting quantum processors with signal-crosstalk performance competitive with those reported in other platforms. For capacitively coupled qubit-drive lines, we find on-resonant crosstalk better than -27 dB (average -37 dB). For inductively coupled magnetic-flux-drive lines, we find less than 0.13% direct-current flux crosstalk (average 0.05%). These observed crosstalk levels are adequately small and indicate a decreasing trend with increasing distance, which is promising for further scaling up to larger numbers of qubits. We discuss the implications of our results for the design of a low-crosstalk on-chip signal-delivery architecture, including the influence of a shielding tunnel structure, potential sources of crosstalk, and estimation of crosstalk-induced qubit-gate error in scaled-up quantum processors.

Original language	English
Article number	030350
Journal	PRX Quantum
Volume	5
Issue number	3
DOIs	https://doi.org/10.1103/PRXQuantum.5.030350
Publication status	Published - Jul 2024
MoE publication type	A1 Journal article-refereed

Funding

This work was funded by the Knut and Alice Wallenberg (KAW) Foundation through the Wallenberg Centre for Quantum Technology (WACQT) and the European Union Flagship on Quantum Technology HORIZON-CL4-2022-QUANTUM-01-SGA project 101113946 OpenSuperQPlus100. We are grateful to Eleftherios Moschandreou for the technical support. We acknowledge the use of support and resources from Myfab Chalmers, the National Academic Infrastructure for Supercomputing in Sweden (NAISS), and the Swedish National Infrastructure for Computing (SNIC) at Link\u00F6ping University (partially funded by the Swedish Research Council through Grant Agreements No. 2022-06725 and No. 2018-05973).

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Kosen, S., Li, H. X., Rommel, M., Rehammar, R., Caputo, M., Grönberg, L., Fernández-Pendás, J., Kockum, A. F., Biznárová, J., Chen, L., KriŽan, C., Nylander, A., Osman, A., Roudsari, A. F., Shiri, D., Tancredi, G., Govenius, J., & Bylander, J. (2024). Signal Crosstalk in a Flip-Chip Quantum Processor. PRX Quantum, 5(3), Article 030350. https://doi.org/10.1103/PRXQuantum.5.030350

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abstract = "Quantum processors require a signal-delivery architecture with high addressability (low crosstalk) to ensure high performance already at the scale of dozens of qubits. Signal crosstalk causes inadvertent driving of quantum gates, which will adversely affect quantum gate fidelities in scaled-up devices. Here, we demonstrate packaged flip-chip superconducting quantum processors with signal-crosstalk performance competitive with those reported in other platforms. For capacitively coupled qubit-drive lines, we find on-resonant crosstalk better than -27 dB (average -37 dB). For inductively coupled magnetic-flux-drive lines, we find less than 0.13% direct-current flux crosstalk (average 0.05%). These observed crosstalk levels are adequately small and indicate a decreasing trend with increasing distance, which is promising for further scaling up to larger numbers of qubits. We discuss the implications of our results for the design of a low-crosstalk on-chip signal-delivery architecture, including the influence of a shielding tunnel structure, potential sources of crosstalk, and estimation of crosstalk-induced qubit-gate error in scaled-up quantum processors.",

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AU - Li, Hang Xi

AU - Rommel, Marcus

AU - Rehammar, Robert

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AU - Fernández-Pendás, Jorge

AU - Kockum, Anton Frisk

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AU - Chen, Liangyu

AU - KriŽan, Christian

AU - Nylander, Andreas

AU - Osman, Amr

AU - Roudsari, Anita Fadavi

AU - Shiri, Daryoush

AU - Tancredi, Giovanna

AU - Govenius, Joonas

AU - Bylander, Jonas

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Signal Crosstalk in a Flip-Chip Quantum Processor

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