Two-qubit silicon quantum processor with operation fidelity exceeding 99%

TL;DR

This paper demonstrates a silicon-based two-qubit quantum processor with high fidelity in state preparation, readout, and gate operations, showcasing its potential for scalable quantum computing.

Contribution

The authors present a silicon spin qubit processor achieving over 97% fidelity in state prep and readout, and over 99% in single- and two-qubit gates, a significant advancement.

Findings

State preparation and readout fidelity over 97%

Single- and two-qubit gate fidelities exceeding 99%

Quantitative characterization using gate set tomography and randomized benchmarking

Abstract

Silicon spin qubits satisfy the necessary criteria for quantum information processing. However, a demonstration of high fidelity state preparation and readout combined with high fidelity single- and two-qubit gates, all of which must be present for quantum error correction, has been lacking. We use a two qubit Si/SiGe quantum processor to demonstrate state preparation and readout with fidelity over 97%, combined with both single- and two-qubit control fidelities exceeding 99%. The operation of the quantum processor is quantitatively characterized using gate set tomography and randomized benchmarking. Our results highlight the potential of silicon spin qubits to become a dominant technology in the development of intermediate-scale quantum processors.