Engineering Purely Nonlinear Coupling between Superconducting Qubits Using a Quarton
Strong nonlinear coupling of superconducting qubits and/or photons is a critical building block for quantum information processing. Because of the perturbative nature of the Josephson nonlinearity, linear coupling is often used in the dispersive regime to approximate nonlinear coupling. However, thi...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society (APS)
2022
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| Online Access: | https://hdl.handle.net/1721.1/143807 |
| _version_ | 1826202252849709056 |
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| author | Ye, Yufeng Peng, Kaidong Naghiloo, Mahdi Cunningham, Gregory O’Brien, Kevin P |
| author2 | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science |
| author_facet | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Ye, Yufeng Peng, Kaidong Naghiloo, Mahdi Cunningham, Gregory O’Brien, Kevin P |
| author_sort | Ye, Yufeng |
| collection | MIT |
| description | Strong nonlinear coupling of superconducting qubits and/or photons is a critical building block for quantum information processing. Because of the perturbative nature of the Josephson nonlinearity, linear coupling is often used in the dispersive regime to approximate nonlinear coupling. However, this dispersive coupling is weak and the underlying linear coupling mixes the local modes, which, for example, distributes unwanted self-Kerr nonlinearity to photon modes. Here, we use the quarton to yield purely nonlinear coupling between two linearly decoupled transmon qubits. The quarton's zero ϕ^{2} potential enables an ultrastrong gigahertz-level cross-Kerr coupling, which is an order of magnitude stronger compared to existing schemes, and the quarton's positive ϕ^{4} potential can cancel the negative self-Kerr nonlinearity of qubits to linearize them into resonators. This ultrastrong cross-Kerr coupling between bare modes of qubit-qubit, qubit-photon, and even photon-photon is ideal for applications such as single microwave photon detection, ultrafast two-qubit gates, and readout. |
| first_indexed | 2024-09-23T12:04:35Z |
| format | Article |
| id | mit-1721.1/143807 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T12:04:35Z |
| publishDate | 2022 |
| publisher | American Physical Society (APS) |
| record_format | dspace |
| spelling | mit-1721.1/1438072023-02-14T19:18:23Z Engineering Purely Nonlinear Coupling between Superconducting Qubits Using a Quarton Ye, Yufeng Peng, Kaidong Naghiloo, Mahdi Cunningham, Gregory O’Brien, Kevin P Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology. Research Laboratory of Electronics Strong nonlinear coupling of superconducting qubits and/or photons is a critical building block for quantum information processing. Because of the perturbative nature of the Josephson nonlinearity, linear coupling is often used in the dispersive regime to approximate nonlinear coupling. However, this dispersive coupling is weak and the underlying linear coupling mixes the local modes, which, for example, distributes unwanted self-Kerr nonlinearity to photon modes. Here, we use the quarton to yield purely nonlinear coupling between two linearly decoupled transmon qubits. The quarton's zero ϕ^{2} potential enables an ultrastrong gigahertz-level cross-Kerr coupling, which is an order of magnitude stronger compared to existing schemes, and the quarton's positive ϕ^{4} potential can cancel the negative self-Kerr nonlinearity of qubits to linearize them into resonators. This ultrastrong cross-Kerr coupling between bare modes of qubit-qubit, qubit-photon, and even photon-photon is ideal for applications such as single microwave photon detection, ultrafast two-qubit gates, and readout. 2022-07-18T15:28:43Z 2022-07-18T15:28:43Z 2021 2022-07-18T15:22:10Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/143807 Ye, Yufeng, Peng, Kaidong, Naghiloo, Mahdi, Cunningham, Gregory and O’Brien, Kevin P. 2021. "Engineering Purely Nonlinear Coupling between Superconducting Qubits Using a Quarton." Physical Review Letters, 127 (5). en 10.1103/PHYSREVLETT.127.050502 Physical Review Letters Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf American Physical Society (APS) APS |
| spellingShingle | Ye, Yufeng Peng, Kaidong Naghiloo, Mahdi Cunningham, Gregory O’Brien, Kevin P Engineering Purely Nonlinear Coupling between Superconducting Qubits Using a Quarton |
| title | Engineering Purely Nonlinear Coupling between Superconducting Qubits Using a Quarton |
| title_full | Engineering Purely Nonlinear Coupling between Superconducting Qubits Using a Quarton |
| title_fullStr | Engineering Purely Nonlinear Coupling between Superconducting Qubits Using a Quarton |
| title_full_unstemmed | Engineering Purely Nonlinear Coupling between Superconducting Qubits Using a Quarton |
| title_short | Engineering Purely Nonlinear Coupling between Superconducting Qubits Using a Quarton |
| title_sort | engineering purely nonlinear coupling between superconducting qubits using a quarton |
| url | https://hdl.handle.net/1721.1/143807 |
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