Quantum Crosstalk Analysis for Simultaneous Gate Operations on Superconducting Qubits
Maintaining or even improving gate performance with growing numbers of parallel controlled qubits is a vital requirement for fault-tolerant quantum computing. For superconducting quantum processors, though isolated one- or two-qubit gates have been demonstrated with high fidelity, implementing these...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2022-04-01
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| Series: | PRX Quantum |
| Online Access: | http://doi.org/10.1103/PRXQuantum.3.020301 |
| _version_ | 1818755264555253760 |
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| author | Peng Zhao Kehuan Linghu Zhiyuan Li Peng Xu Ruixia Wang Guangming Xue Yirong Jin Haifeng Yu |
| author_facet | Peng Zhao Kehuan Linghu Zhiyuan Li Peng Xu Ruixia Wang Guangming Xue Yirong Jin Haifeng Yu |
| author_sort | Peng Zhao |
| collection | DOAJ |
| description | Maintaining or even improving gate performance with growing numbers of parallel controlled qubits is a vital requirement for fault-tolerant quantum computing. For superconducting quantum processors, though isolated one- or two-qubit gates have been demonstrated with high fidelity, implementing these gates in parallel commonly shows worse performance. Generally, this degradation is attributed to various crosstalks between qubits, such as quantum crosstalk due to residual inter-qubit coupling. An understanding of the exact nature of these crosstalks is critical to figuring out respective mitigation schemes and improved qubit architecture designs with low crosstalk. Here we give a theoretical analysis of quantum crosstalk impact on simultaneous gate operations in a qubit architecture, where fixed-frequency transmon qubits are coupled via a tunable bus, and sub-100-ns controlled-Z (cz) gates can be realized by applying a baseband flux pulse on the bus. Our analysis shows that for microwave-driven single-qubit gates, the dressing from the qubit-qubit coupling can cause non-negligible cross-driving errors when qubits operate near frequency collision regions. During cz gate operations, although unwanted nearest-neighbor interactions are nominally turned off, sub-MHz parasitic next-nearest-neighbor interactions involving spectator qubits can still exist, causing considerable leakage or control error when one operates qubit systems around these parasitic resonance points. To ensure high-fidelity simultaneous operations, a request could be raised to figure out a better way to balance the gate error from target qubit systems themselves and the error from nonparticipating spectator qubits. Overall, our analysis suggests that towards useful quantum processors, the qubit architecture should be examined carefully in the context of high-fidelity simultaneous gate operations in a scalable qubit lattice. |
| first_indexed | 2024-12-18T05:36:23Z |
| format | Article |
| id | doaj.art-120125ff656a4a14986cc3733c3635e4 |
| institution | Directory Open Access Journal |
| issn | 2691-3399 |
| language | English |
| last_indexed | 2024-12-18T05:36:23Z |
| publishDate | 2022-04-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | PRX Quantum |
| spelling | doaj.art-120125ff656a4a14986cc3733c3635e42022-12-21T21:19:19ZengAmerican Physical SocietyPRX Quantum2691-33992022-04-013202030110.1103/PRXQuantum.3.020301Quantum Crosstalk Analysis for Simultaneous Gate Operations on Superconducting QubitsPeng ZhaoKehuan LinghuZhiyuan LiPeng XuRuixia WangGuangming XueYirong JinHaifeng YuMaintaining or even improving gate performance with growing numbers of parallel controlled qubits is a vital requirement for fault-tolerant quantum computing. For superconducting quantum processors, though isolated one- or two-qubit gates have been demonstrated with high fidelity, implementing these gates in parallel commonly shows worse performance. Generally, this degradation is attributed to various crosstalks between qubits, such as quantum crosstalk due to residual inter-qubit coupling. An understanding of the exact nature of these crosstalks is critical to figuring out respective mitigation schemes and improved qubit architecture designs with low crosstalk. Here we give a theoretical analysis of quantum crosstalk impact on simultaneous gate operations in a qubit architecture, where fixed-frequency transmon qubits are coupled via a tunable bus, and sub-100-ns controlled-Z (cz) gates can be realized by applying a baseband flux pulse on the bus. Our analysis shows that for microwave-driven single-qubit gates, the dressing from the qubit-qubit coupling can cause non-negligible cross-driving errors when qubits operate near frequency collision regions. During cz gate operations, although unwanted nearest-neighbor interactions are nominally turned off, sub-MHz parasitic next-nearest-neighbor interactions involving spectator qubits can still exist, causing considerable leakage or control error when one operates qubit systems around these parasitic resonance points. To ensure high-fidelity simultaneous operations, a request could be raised to figure out a better way to balance the gate error from target qubit systems themselves and the error from nonparticipating spectator qubits. Overall, our analysis suggests that towards useful quantum processors, the qubit architecture should be examined carefully in the context of high-fidelity simultaneous gate operations in a scalable qubit lattice.http://doi.org/10.1103/PRXQuantum.3.020301 |
| spellingShingle | Peng Zhao Kehuan Linghu Zhiyuan Li Peng Xu Ruixia Wang Guangming Xue Yirong Jin Haifeng Yu Quantum Crosstalk Analysis for Simultaneous Gate Operations on Superconducting Qubits PRX Quantum |
| title | Quantum Crosstalk Analysis for Simultaneous Gate Operations on Superconducting Qubits |
| title_full | Quantum Crosstalk Analysis for Simultaneous Gate Operations on Superconducting Qubits |
| title_fullStr | Quantum Crosstalk Analysis for Simultaneous Gate Operations on Superconducting Qubits |
| title_full_unstemmed | Quantum Crosstalk Analysis for Simultaneous Gate Operations on Superconducting Qubits |
| title_short | Quantum Crosstalk Analysis for Simultaneous Gate Operations on Superconducting Qubits |
| title_sort | quantum crosstalk analysis for simultaneous gate operations on superconducting qubits |
| url | http://doi.org/10.1103/PRXQuantum.3.020301 |
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