Dynamical Sweet Spot Engineering via Two-Tone Flux Modulation of Superconducting Qubits
Current superconducting quantum processors require strategies for coping with material defects and imperfect parameter targeting in order to scale up while maintaining high performance. To that end, in situ control of qubit frequencies with magnetic flux can be used to avoid spurious resonances. How...
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| Published in: | PRX quantum Vol. 3; no. 2; p. 020337 |
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| Main Authors: | , , , |
| Format: | Journal Article |
| Language: | English |
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American Physical Society
01-05-2022
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| Abstract | Current superconducting quantum processors require strategies for coping with material defects and imperfect parameter targeting in order to scale up while maintaining high performance. To that end, in situ control of qubit frequencies with magnetic flux can be used to avoid spurious resonances. However, increased dephasing due to 1/f flux noise limits performance at all of these operating points except for noise-protected sweet spots, which are sparse under dc flux bias and monochromatic flux modulation. Here we experimentally demonstrate that two-tone flux modulation can be used to create a continuum of dynamical sweet spots, greatly expanding the range of qubit frequencies achievable while first-order insensitive to slow flux noise. To illustrate some advantages of this flexibility, we use bichromatic flux control to reduce the error rates and gate times of parametric entangling operations between transmons. Independent of the gate scheme, the ability to use flux control to freely select qubit frequencies while maintaining qubit coherence represents an important step forward in the robustness and scalability of near-term superconducting qubit devices. |
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| AbstractList | Current superconducting quantum processors require strategies for coping with material defects and imperfect parameter targeting in order to scale up while maintaining high performance. To that end, in situ control of qubit frequencies with magnetic flux can be used to avoid spurious resonances. However, increased dephasing due to 1/f flux noise limits performance at all of these operating points except for noise-protected sweet spots, which are sparse under dc flux bias and monochromatic flux modulation. Here we experimentally demonstrate that two-tone flux modulation can be used to create a continuum of dynamical sweet spots, greatly expanding the range of qubit frequencies achievable while first-order insensitive to slow flux noise. To illustrate some advantages of this flexibility, we use bichromatic flux control to reduce the error rates and gate times of parametric entangling operations between transmons. Independent of the gate scheme, the ability to use flux control to freely select qubit frequencies while maintaining qubit coherence represents an important step forward in the robustness and scalability of near-term superconducting qubit devices. |
| ArticleNumber | 020337 |
| Author | Didier, Nicolas Valery, Joseph A. Jones, Glenn Chowdhury, Shoumik |
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| CitedBy_id | crossref_primary_10_1103_PhysRevApplied_20_044012 crossref_primary_10_1103_PhysRevLett_132_067001 crossref_primary_10_1038_s41467_024_46623_y crossref_primary_10_1088_1361_6668_acaa64 crossref_primary_10_1103_PhysRevApplied_17_064006 crossref_primary_10_1103_PhysRevApplied_21_024035 crossref_primary_10_1088_1367_2630_acacbd crossref_primary_10_22331_q_2023_11_03_1158 crossref_primary_10_1103_PhysRevApplied_18_L061001 crossref_primary_10_1103_PhysRevA_108_012407 crossref_primary_10_1103_PhysRevResearch_6_023029 crossref_primary_10_1103_PRXQuantum_5_020339 |
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