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

TL;DR

This paper demonstrates a rapid and highly accurate parity spin measurement in silicon double quantum dots, achieving over 99% fidelity within a few microseconds, advancing quantum error correction capabilities.

Contribution

It introduces a fast, high-fidelity parity spin readout method in silicon quantum dots, crucial for scalable quantum computing.

Findings

Achieved >99% fidelity in spin measurement

Performed measurement within a few microseconds

Enhanced prospects for quantum error correction in silicon

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.