Diraq solid state quantum processor achieves fidelity benchmark

Quantum computing processor developer Diraq has successfully demonstrated consistent and repeatable operation with above 99 percent fidelity of two-qubit gates in its SiMOS (silicon metal-oxide-semiconductor) quantum dot platform.

The technical breakthrough in producing workable quantum computing chips was detailed in a study: Assessment of the errors of high-fidelity two-qubit gates in silicon quantum dots published tonight (Tuesday) in the journal Nature Physics.

According to the company, consistent performance is key to the underlying integrity and capability of multi-qubit systems.

Quantum computers store information at the sub-atomic level, with a qubit the quantum equivalent of a bit in traditional computing.

For Diraq, achieving the benchmark represents a crucial step towards the protection against errors in solid state qubits, paving the way for realising more reliable silicon-based quantum devices.

Solid-state qubits, such as Diraq’s CMOS quantum dots,are compatible with the mass manufacturing techniques used for today’s silicon chips, promising scalability and cost-efficiency.

Diraq Founder and CEO Andrew Dzurak said: “Reaching this 99 percent two qubit fidelity is a significant milestone in our technical programme as it underpins the process for securing consistent and reliable performance in our SiMOS quantum dot qubits and further supports our core focus of scaling up our silicon spin-based qubits into full-scale fault tolerant quantum processors.”

Research led by Tuomo Tanttu and colleagues identified strategies for improving high-fidelity operations.

The study yielded evidence for the systematic improvement of the robustness, consistency, and reliability of the entangling gate fidelities by employing a careful and considered implementation of gate recalibration combined with an informed choice of physical materials and pulse engineering, according to Diraq.

“As part of this analysis, the team diligently focused on measuring sustained performance to underpin fault tolerant quantum processors, using three different characterisation methods – verifying the consistency of our two-qubit gate operations by reproducing them in multiple devices.”

Dzurak said: “What sets Diraq apart and reinforces Diraq’s leadership position in silicon quantum computing technologies is not only the depth of our scientific understanding, but the quality and rigour of our approach, combined with the technical excellence of our team.

“It is only through the rigorous and comprehensive testing and analysis of our CMOS quantum dot qubits that we will reach our technical and performance milestones, and ultimately achieve a fully error-corrected quantum computing system ahead of our competitors.”

Further reading:
Diraq demonstrates high fidelity quantum chips

Picture: Diraq