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.

doi:10.1103/PhysRevX.14.041030

Title: Modular Quantum Processor with an All-to-All Reconfigurable Router

Journal Article · 03 November 2024 · Physical Review. X

DOI: https://doi.org/10.1103/PhysRevX.14.041030 · OSTI ID:2476063

;

; Chou, Ming-Han;

;

; Joshi, Yash J.;

;

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 multilayer 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 $96.00 % \pm 0.08 %$ and best fidelity of $97.14 % \pm 0.07 %$ , limited mainly by dephasing in the qubits. We also generate multiqubit entanglement, distributed across the separate modules, demonstrating GHZ-3 and GHZ-4 states with fidelities of $88.15 % \pm 0.24 %$ and $75.18 % \pm 0.11 %$ , 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. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

OSTI ID:: 2476063

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Journal Issue: 4 Vol. 14; ISSN PRXHAE; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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