A shuttling-based two-qubit logic gate for linking distant silicon quantum processors.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
30 Sep 2022
30 Sep 2022
Historique:
received:
02
02
2022
accepted:
16
09
2022
entrez:
30
9
2022
pubmed:
1
10
2022
medline:
1
10
2022
Statut:
epublish
Résumé
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.
Identifiants
pubmed: 36180449
doi: 10.1038/s41467-022-33453-z
pii: 10.1038/s41467-022-33453-z
pmc: PMC9525571
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
5740Subventions
Organisme : MEXT | Japan Society for the Promotion of Science (JSPS)
ID : 19K14640
Organisme : MEXT | Japan Society for the Promotion of Science (JSPS)
ID : 20H00237
Organisme : MEXT | Japan Society for the Promotion of Science (JSPS)
ID : 18H01819
Organisme : MEXT | Japan Society for the Promotion of Science (JSPS)
ID : 16H02204
Organisme : MEXT | JST | Core Research for Evolutional Science and Technology (CREST)
ID : JPMJCR15N2
Organisme : MEXT | JST | Core Research for Evolutional Science and Technology (CREST)
ID : JPMJCR1675
Organisme : MEXT | JST | Precursory Research for Embryonic Science and Technology (PRESTO)
ID : JPMJPR2017
Commentaires et corrections
Type : ErratumIn
Informations de copyright
© 2022. The Author(s).
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