Modular quantum processor with an all-to-all reconfigurable router
Xuntao Wu, Haoxiong Yan, Gustav Andersson, Alexander Anferov, Ming-Han Chou, Christopher R. Conner, Joel Grebel, Yash J. Joshi, Shiheng Li, Jacob M. Miller, Rhy… 展开作者
Xuntao Wu, Haoxiong Yan, Gustav Andersson, Alexander Anferov, Ming-Han Chou, Christopher R. Conner, Joel Grebel, Yash J. Joshi, Shiheng Li, Jacob M. Miller, Rhys G. Povey, Hong Qiao, Andrew N. Cleland
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.
Efficient $n$-qubit entangling operations via a superconducting quantum router
Pritzker School of Molecular Engineering, University of Chicago（芝加哥大学普里茨克分子工程学院）；Applied Materials Inc（应用材料公司）；Department of Physics, ETH Zürich（苏黎世联邦理工学院物理系）；Department of Physics, University of Chicago（芝加哥大学物理系）
A cavity-mediated reconfigurable coupling scheme for superconducting qubits
Pritzker School of Molecular Engineering, University of Chicago（芝加哥大学普里茨克分子工程学院）；Institute of Applied Physics, Seoul National University（首尔国立大学应用物理研究所）；NextQuantum Innovation Research Center, Seoul National University（首尔国立大学NextQuantum创新中心）；Department of Physics and Astronomy, Seoul National University（首尔国立大学物理与天文学系）
Hardware-Efficient Universal Linear Transformations for Optical Modes in the Synthetic Time Dimension
Department of Electrical and Computer Engineering, University of Maryland（马里兰大学电气与计算机工程系）；Institute for Research in Electronics and Applied Physics, and Joint Quantum Institute, University of Maryland（马里兰大学电子与应用物理研究所及联合量子研究所）；James C. Wyant College of Optical Sciences, University of Arizona（亚利桑那大学詹姆斯·C·怀安特光学科学学院）
Reconfigurable Superconducting Quantum Circuits Enabled by Micro-Scale Liquid-Metal Interconnects
Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area（粤港澳大湾区量子科学中心）；Division of Materials Science and Engineering, Boston University（波士顿大学材料科学与工程系）；Department of Electrical and Computer Engineering, Boston University（波士顿大学电气与计算机工程系）；Department of Physics, Boston University（波士顿大学物理系）；IBM Quantum, IBM T.J. Watson Research Center（IBM量子，IBM托马斯·J·沃森研究中心）；Department of Chemistry, Boston University（波士顿大学化学系）；Department of Mechanical Engineering, Boston University（波士顿大学机械工程系）；Department of Biomedical Engineering, Boston University（波士顿大学生物医学工程系）
Fast Nondestructive Readout for High-Clock-Rate Atom Array Quantum Processor
Hefei National Research Center for Physical Sciences at the Microscale and Department of Modern Physics, New Cornerstone Science Laboratory, University of Science and Technology of China（中国科学院合肥物质科学研究院近代物理研究所、新Cornerstone科学实验室、中国科学技术大学）
