Long-Range $ZZ$ Interaction via Resonator-Induced Phase in Superconducting Qubits
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arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866912418447228928 |
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| author | Deng, Xiang Zheng, Wen Liao, Xudong Zhou, Haoyu Ge, Yangyang Zhao, Jie Lan, Dong Tan, Xinsheng Zhang, Yu Li, Shaoxiong Yu, Yang |
| author_facet | Deng, Xiang Zheng, Wen Liao, Xudong Zhou, Haoyu Ge, Yangyang Zhao, Jie Lan, Dong Tan, Xinsheng Zhang, Yu Li, Shaoxiong Yu, Yang |
| contents | Superconducting quantum computing emerges as one of leading candidates for achieving quantum advantage. However, a prevailing challenge is the coding overhead due to limited quantum connectivity, constrained by nearest-neighbor coupling among superconducting qubits. Here, we propose a novel multimode coupling scheme using three resonators driven by two microwaves, based on the resonator-induced phase gate, to extend the $ZZ$ interaction distance between qubits. We demonstrate a CZ gate fidelity exceeding 99.9\% within 160 ns at free spectral range (FSR) of 1.4 GHz, and by optimizing driving pulses, we further reduce the residual photon to nearly $10^{-3}$ within 100 ns at FSR of 0.2 GHz. These facilitate the long-range CZ gate over separations reaching sub-meters, thus significantly enhancing qubit connectivity and making a practical step towards the scalable integration and modularization of quantum processors. Specifically, our approach supports the implementation of quantum error correction codes requiring high connectivity, such as low-density parity check codes that paves the way to achieving fault-tolerant quantum computing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_16617 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Long-Range $ZZ$ Interaction via Resonator-Induced Phase in Superconducting Qubits Deng, Xiang Zheng, Wen Liao, Xudong Zhou, Haoyu Ge, Yangyang Zhao, Jie Lan, Dong Tan, Xinsheng Zhang, Yu Li, Shaoxiong Yu, Yang Quantum Physics Superconducting quantum computing emerges as one of leading candidates for achieving quantum advantage. However, a prevailing challenge is the coding overhead due to limited quantum connectivity, constrained by nearest-neighbor coupling among superconducting qubits. Here, we propose a novel multimode coupling scheme using three resonators driven by two microwaves, based on the resonator-induced phase gate, to extend the $ZZ$ interaction distance between qubits. We demonstrate a CZ gate fidelity exceeding 99.9\% within 160 ns at free spectral range (FSR) of 1.4 GHz, and by optimizing driving pulses, we further reduce the residual photon to nearly $10^{-3}$ within 100 ns at FSR of 0.2 GHz. These facilitate the long-range CZ gate over separations reaching sub-meters, thus significantly enhancing qubit connectivity and making a practical step towards the scalable integration and modularization of quantum processors. Specifically, our approach supports the implementation of quantum error correction codes requiring high connectivity, such as low-density parity check codes that paves the way to achieving fault-tolerant quantum computing. |
| title | Long-Range $ZZ$ Interaction via Resonator-Induced Phase in Superconducting Qubits |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2408.16617 |