A shuttling-based two-qubit logic gate for linking distant silicon quantum processors

Akito Noiri (), Kenta Takeda, Takashi Nakajima, Takashi Kobayashi, Amir Sammak, Giordano Scappucci and Seigo Tarucha ()
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Akito Noiri: RIKEN Center for Emergent Matter Science (CEMS)
Kenta Takeda: RIKEN Center for Emergent Matter Science (CEMS)
Takashi Nakajima: RIKEN Center for Emergent Matter Science (CEMS)
Takashi Kobayashi: RIKEN Center for Quantum Computing (RQC)
Amir Sammak: QuTech, Delft University of Technology
Giordano Scappucci: QuTech, Delft University of Technology
Seigo Tarucha: RIKEN Center for Emergent Matter Science (CEMS)

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-33453-z

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