Rapid single-shot parity spin readout in a silicon double quantum dot with fidelity exceeding 99 %

Abstract

Silicon-based spin qubits offer a potential pathway toward realizing a scalable quantum computer owing to their compatibility with semiconductor manufacturing technologies. Recent experiments in this system have demonstrated crucial technologies, including high-fidelity quantum gates and multiqubit operation. However, the realization of a fault-tolerant quantum computer requires a high-fidelity spin measurement faster than decoherence. To address this challenge, we characterize and optimize the initialization and measurement procedures using the parity-mode Pauli spin blockade technique. Here, we demonstrate a rapid (with a duration of a few us) and accurate (with >99% fidelity) parity spin measurement in a silicon double quantum dot. These results represent a significant step forward toward implementing measurement-based quantum error correction in silicon.

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• Single-shot read-out of an individual electron spin in a quantum dot
• Suppressing quantum errors by scaling a surface code logical qubit
• Computing with spin qubits at the surface code error threshold
• Fast universal quantum control above the fault-tolerance threshold in silicon
• Universal control of a six-qubit quantum processor in silicon
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• High fidelity state preparation, quantum control, and readout of an isotopically enriched silicon spin qubit
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