Modular quantum processor with an all-to-all reconfigurable router
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arXiv
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| Format: | Preprint |
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2024
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| author | Wu, Xuntao Yan, Haoxiong Andersson, Gustav Anferov, Alexander Chou, Ming-Han Conner, Christopher R. Grebel, Joel Joshi, Yash J. Li, Shiheng Miller, Jacob M. Povey, Rhys G. Qiao, Hong Cleland, Andrew N. |
| author_facet | Wu, Xuntao Yan, Haoxiong Andersson, Gustav Anferov, Alexander Chou, Ming-Han Conner, Christopher R. Grebel, Joel Joshi, Yash J. Li, Shiheng Miller, Jacob M. Povey, Rhys G. Qiao, Hong Cleland, Andrew N. |
| contents | Superconducting qubits provide a promising approach to large-scale fault-tolerant quantum computing. However, qubit connectivity on a planar surface is typically restricted to only a few neighboring qubits. Achieving longer-range and more flexible connectivity, which is particularly appealing in light of recent developments in error-correcting codes, however usually involves complex multi-layer packaging and external cabling, which is resource-intensive and can impose fidelity limitations. Here, we propose and realize a high-speed on-chip quantum processor that supports reconfigurable all-to-all coupling with a large on-off ratio. We implement the design in a four-node quantum processor, built with a modular design comprising a wiring substrate coupled to two separate qubit-bearing substrates, each including two single-qubit nodes. We use this device to demonstrate reconfigurable controlled-Z gates across all qubit pairs, with a benchmarked average fidelity of $96.00\%\pm0.08\%$ and best fidelity of $97.14\%\pm0.07\%$, limited mainly by dephasing in the qubits. We also generate multi-qubit entanglement, distributed across the separate modules, demonstrating GHZ-3 and GHZ-4 states with fidelities of $88.15\%\pm0.24\%$ and $75.18\%\pm0.11\%$, respectively. This approach promises efficient scaling to larger-scale quantum circuits, and offers a pathway for implementing quantum algorithms and error correction schemes that benefit from enhanced qubit connectivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_20134 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Modular quantum processor with an all-to-all reconfigurable router Wu, Xuntao Yan, Haoxiong Andersson, Gustav Anferov, Alexander Chou, Ming-Han Conner, Christopher R. Grebel, Joel Joshi, Yash J. Li, Shiheng Miller, Jacob M. Povey, Rhys G. Qiao, Hong Cleland, Andrew N. Quantum Physics Superconducting qubits provide a promising approach to large-scale fault-tolerant quantum computing. However, qubit connectivity on a planar surface is typically restricted to only a few neighboring qubits. Achieving longer-range and more flexible connectivity, which is particularly appealing in light of recent developments in error-correcting codes, however usually involves complex multi-layer packaging and external cabling, which is resource-intensive and can impose fidelity limitations. Here, we propose and realize a high-speed on-chip quantum processor that supports reconfigurable all-to-all coupling with a large on-off ratio. We implement the design in a four-node quantum processor, built with a modular design comprising a wiring substrate coupled to two separate qubit-bearing substrates, each including two single-qubit nodes. We use this device to demonstrate reconfigurable controlled-Z gates across all qubit pairs, with a benchmarked average fidelity of $96.00\%\pm0.08\%$ and best fidelity of $97.14\%\pm0.07\%$, limited mainly by dephasing in the qubits. We also generate multi-qubit entanglement, distributed across the separate modules, demonstrating GHZ-3 and GHZ-4 states with fidelities of $88.15\%\pm0.24\%$ and $75.18\%\pm0.11\%$, respectively. This approach promises efficient scaling to larger-scale quantum circuits, and offers a pathway for implementing quantum algorithms and error correction schemes that benefit from enhanced qubit connectivity. |
| title | Modular quantum processor with an all-to-all reconfigurable router |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2407.20134 |