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Fast universal quantum gate above the fault-tolerance threshold in silicon
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Journal Article
Fast universal quantum gate above the fault-tolerance threshold in silicon
2022
Overview
Fault-tolerant quantum computers that can solve hard problems rely on quantum error correction
1
. One of the most promising error correction codes is the surface code
2
, which requires universal gate fidelities exceeding an error correction threshold of 99 per cent
3
. Among the many qubit platforms, only superconducting circuits
4
, trapped ions
5
and nitrogen-vacancy centres in diamond
6
have delivered this requirement. Electron spin qubits in silicon
7
–
15
are particularly promising for a large-scale quantum computer owing to their nanofabrication capability, but the two-qubit gate fidelity has been limited to 98 per cent owing to the slow operation
16
. Here we demonstrate a two-qubit gate fidelity of 99.5 per cent, along with single-qubit gate fidelities of 99.8 per cent, in silicon spin qubits by fast electrical control using a micromagnet-induced gradient field and a tunable two-qubit coupling. We identify the qubit rotation speed and coupling strength where we robustly achieve high-fidelity gates. We realize Deutsch–Jozsa and Grover search algorithms with high success rates using our universal gate set. Our results demonstrate universal gate fidelity beyond the fault-tolerance threshold and may enable scalable silicon quantum computers.
Single- and two-qubit gate fidelities above the fault-tolerance threshold for quantum computation are demonstrated in silicon quantum dots by fast electrical control using a micromagnet-induced gradient field and tunable coupling.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
