Print Email Facebook Twitter A shuttling-based two-qubit logic gate for linking distant silicon quantum processors Title A shuttling-based two-qubit logic gate for linking distant silicon quantum processors Author Noiri, A. Takeda, K. Nakajima, T. Kobayashi, T. Sammak, A. Scappucci, G. Tarucha, S. Publication year 2022 Abstract Control of entanglement between qubits at distant quantum processors using a two-qubit gate is an essential function of a scalable, modular implementation of quantum computation. Among the many qubit platforms, spin qubits in silicon quantum dots are promising for large-scale integration along with their nanofabrication capability. However, linking distant silicon quantum processors is challenging as two-qubit gates in spin qubits typically utilize short-range exchange coupling, which is only effective between nearest-neighbor quantum dots. Here we demonstrate a two-qubit gate between spin qubits via coherent spin shuttling, a key technology for linking distant silicon quantum processors. Coherent shuttling of a spin qubit enables efficient switching of the exchange coupling with an on/off ratio exceeding 1000, while preserving the spin coherence by 99.6% for the single shuttling between neighboring dots. With this shuttling-mode exchange control, we demonstrate a two-qubit controlled-phase gate with a fidelity of 93%, assessed via randomized benchmarking. Combination of our technique and a phase coherent shuttling of a qubit across a large quantum dot array will provide feasible path toward a quantum link between distant silicon quantum processors, a key requirement for large-scale quantum computation. Subject GermaniumQuantum dotQuantum processorsSiliconQuantum mechanics To reference this document use: http://resolver.tudelft.nl/uuid:d595c889-329f-4c31-b06c-33206320adc0 DOI https://doi.org/10.1038/s41467-022-33453-z TNO identifier 977310 Publisher Springer/Nature, Heidelberg, Germany ISSN 2041-1723 Source Nature Communications, 13 (13) Document type article Files To receive the publication files, please send an e-mail request to TNO Library.