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Flux-noise insensitive and flux-tunable superconducting qubit

Eyob Alebachew Sete, Matthew J. Reagor, Nicolas Didier +1 more

Bulletin of the American Physical SocietyMar 15, 20170 citations

Tunable Superconducting Qubits with Flux-Independent Coherence

M. D. Hutchings, J. B. Hertzberg, Y. Liu +5 more

As superconducting-qubit architectures progress to more complex layouts, frequency crowding in qubit arrays increasingly hinders computing performance. Frequency-tunable qubits can assuage this problem, but are subject to the magnetic-flux noise that is ubiquitous in such circuitry. The authors exploit asymmetric Josephson junctions in transmon qubits to reduce sensitivity to flux noise, while preserving sufficient tunability to avoid frequency collisions. In their most asymmetric qubit, dephasing due to flux noise is reduced to the point where its rate is independent of the flux bias.As superconducting-qubit architectures progress to more complex layouts, frequency crowding in qubit arrays increasingly hinders computing performance. Frequency-tunable qubits can assuage this problem, but are subject to the magnetic-flux noise that is ubiquitous in such circuitry. The authors exploit asymmetric Josephson junctions in transmon qubits to reduce sensitivity to flux noise, while preserving sufficient tunability to avoid frequency collisions. In their most asymmetric qubit, dephasing due to flux noise is reduced to the point where its rate is independent of the flux bias.

arXiv:1702.02253Physical Review AppliedOct 12, 2017190 citations

Flux Tunable Superconductings Qubits With 3D Wiring

J. H. Béjanin, C. T. Earnest, Thomas McConkey +2 more

Bulletin of the American Physical SocietyMar 7, 20190 citations

Weakly Flux-Tunable Superconducting Qubit

José Chavez-Garcia, Firat Solgun, Jared Hertzberg +3 more

Superconducting qubits are building blocks for quantum processors, but they suffer from frequency collisions, which hinder the construction of large qubit lattices. This study introduces weakly tunable qubits, whose frequency can be tuned over a small range via external magnetic flux. Through theoretical derivation and experimental demonstration, the authors show that these transmonlike qubits---without losing the desired key properties---can be used to avoid frequency collisions in large qubit systems while minimizing the sensitivity to flux noise. They can also be applied to operate flux-tuned qubit gates.Superconducting qubits are building blocks for quantum processors, but they suffer from frequency collisions, which hinder the construction of large qubit lattices. This study introduces weakly tunable qubits, whose frequency can be tuned over a small range via external magnetic flux. Through theoretical derivation and experimental demonstration, the authors show that these transmonlike qubits---without losing the desired key properties---can be used to avoid frequency collisions in large qubit systems while minimizing the sensitivity to flux noise. They can also be applied to operate flux-tuned qubit gates.

arXiv:2203.04164Physical Review AppliedSep 22, 202218 citations

Measurement of low frequency flux noise in superconducting flux qubits

Wei Qiu, Bo Mao, Yang Yu +2 more

Bulletin of the American Physical SocietyMar 11, 20080 citations

Investigation of 1/f flux noise in SQUIDs and Superconducting Qubits

Antonio Puglielli, S. Sendelbach, Taylor Klaus +1 more

Bulletin of the American Physical SocietyMar 19, 20130 citations

Tunable Superconducting Qubits with Reduced Sensitivity to 1/f flux noise

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Tunable Superconducting Qubits with Reduced Sensitivity to 1/f flux noise

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