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...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2022-05-01
|
| Series: | PRX Quantum |
| Online Access: | http://doi.org/10.1103/PRXQuantum.3.020337 |
| _version_ | 1818231575364501504 |
|---|---|
| author | Joseph A. Valery Shoumik Chowdhury Glenn Jones Nicolas Didier |
| author_facet | Joseph A. Valery Shoumik Chowdhury Glenn Jones Nicolas Didier |
| author_sort | Joseph A. Valery |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-12T10:52:34Z |
| format | Article |
| id | doaj.art-1e90de81c4154cfea507b11e50bb012f |
| institution | Directory Open Access Journal |
| issn | 2691-3399 |
| language | English |
| last_indexed | 2024-12-12T10:52:34Z |
| publishDate | 2022-05-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | PRX Quantum |
| spelling | doaj.art-1e90de81c4154cfea507b11e50bb012f2022-12-22T00:26:44ZengAmerican Physical SocietyPRX Quantum2691-33992022-05-013202033710.1103/PRXQuantum.3.020337Dynamical Sweet Spot Engineering via Two-Tone Flux Modulation of Superconducting QubitsJoseph A. ValeryShoumik ChowdhuryGlenn JonesNicolas DidierCurrent 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.http://doi.org/10.1103/PRXQuantum.3.020337 |
| spellingShingle | Joseph A. Valery Shoumik Chowdhury Glenn Jones Nicolas Didier Dynamical Sweet Spot Engineering via Two-Tone Flux Modulation of Superconducting Qubits PRX Quantum |
| title | Dynamical Sweet Spot Engineering via Two-Tone Flux Modulation of Superconducting Qubits |
| title_full | Dynamical Sweet Spot Engineering via Two-Tone Flux Modulation of Superconducting Qubits |
| title_fullStr | Dynamical Sweet Spot Engineering via Two-Tone Flux Modulation of Superconducting Qubits |
| title_full_unstemmed | Dynamical Sweet Spot Engineering via Two-Tone Flux Modulation of Superconducting Qubits |
| title_short | Dynamical Sweet Spot Engineering via Two-Tone Flux Modulation of Superconducting Qubits |
| title_sort | dynamical sweet spot engineering via two tone flux modulation of superconducting qubits |
| url | http://doi.org/10.1103/PRXQuantum.3.020337 |
| work_keys_str_mv | AT josephavalery dynamicalsweetspotengineeringviatwotonefluxmodulationofsuperconductingqubits AT shoumikchowdhury dynamicalsweetspotengineeringviatwotonefluxmodulationofsuperconductingqubits AT glennjones dynamicalsweetspotengineeringviatwotonefluxmodulationofsuperconductingqubits AT nicolasdidier dynamicalsweetspotengineeringviatwotonefluxmodulationofsuperconductingqubits |