MEMS and Sensors

Diraq achieves record fidelity for single-qubit quantum computing

13 June 2024
The Diraq and imec team showing how qubits were manufactured on a 300mm silicon wafer using standard CMOS materials. Source: Diraq

In what is being called record accuracy for quantum computing using existing semiconductor infrastructure, Australian startup Diraq achieved a 99.9% single-qubit fidelity on a quantum processing device manufactured by research hub Imec using standard CMOS materials on a 300 mm silicon wafer.

The 99.9% fidelity is the level of precision required for full-scale, error-corrected quantum computer processors manufactured on existing silicon chip foundries, Diraq said.

Diraq develops qubits using silicon quantum dots. The technology paves the way for integrating these qubits with standard CMOS transistors on a single chip. American semiconductor foundry GlobalFoundries will manufacture Diraq’s chips based on its 22FDX technology this year. These devices will monolithically integrate silicon qubit devices with standard transistors to push qubit numbers on a chip to the million mark and beyond.

The technology was made possible using qubit control and measurement techniques for silicon qubits that Diraq has developed over the past decade. These technologies include:

  • Real-time feedback
  • Optimized qubit initialization
  • Control voltage pulse shaping
  • Advanced analysis tools like gate set tomography and randomized benchmarking

Why it matters

Because these CMOS qubits are extremely small compared to modern transistors, the technology could potentially place many millions of qubits integrated onto one chip with a similar number of conventional transistors. This differentiates them from other modalities that will require large, energy intensive and costly systems, Diraq said.

“Commercially viable quantum computing capable of revolutionary applications, including the design of targeted pharmaceuticals and advanced materials, must employ quantum error correction processes that will require many millions of qubits,” said Andrew Dzurak, CEO and Founder of Diraq. “Our roadmap to develop quantum processor chips on this scale leverages existing semiconductor foundry capabilities which have benefited from over 60 years of development and trillions of dollars of investment.”

To contact the author of this article, email PBrown@globalspec.com


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