Scalable low-overhead superconducting nonlocal coupler for circuit connectivity enhancement
Haonan Xiong, Jiahui Wang, Juan Song, Jize Yang, Zenghui Bao, Yan Li, Zhen-Yu Mi, Hongyi Zhang, Hai-Feng Yu, Yipu Song, Luming Duan
DOI 10.1103/kfy3-bwgr · Physical Review Applied
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Abstract
Nonlocal connectivity is a critical resource for universal logical quantum gates and low-overhead quantum error correction codes, and is unavailable on current superconducting devices with nearest-neighbor connections. To rectify the deficiency in connectivity of superconducting circuit systems, we experimentally demonstrate a convenient on-chip coupler of centimeters length and with quality factor close to 1×106. The entangling gate is performed between two fluxonium qubits, reaching a fidelity of 99.37% within 120 ns, while the system static ZZ interaction rate remains as low as 144 Hz without active cancellation or circuit parameter targeting. This high-fidelity low-crosstalk nonlocal coupler can be the building block of a binary-tree connectivity graph, reducing the average qubit entangling distance from O(N) to O(log2N). With the high-fidelity nonlocal entanglement, novel quantum algorithms can be implemented on the superconducting qubit system, positioning it as a strong competitor to other physics systems regarding circuit connectivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ta Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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