Quantum Art, a developer of full-stack fault-tolerant quantum computers based on trapped-ion qubits, today announced research results verifying that its multi-qubit gate architecture advances scalable fault-tolerant quantum computing. The findings, validated through detailed microscopic noise modeling and comprehensive fault-tolerance simulations, demonstrate a practical path toward logical qubits and large-scale quantum systems.
The research, published in the paper "Trapped-Ion Multi qubit Gates are Compatible with Scalable Quantum Error Correction," confirms that multi-qubit gates—which can operate on multiple qubits simultaneously—are fully compatible with quantum error correction. This addresses a key milestone for building large-scale quantum computers, as the industry has largely focused on systems based on numerous sequential one- and two-qubit operations. The results show that under realistic noise conditions, multi-qubit gates exhibit a finite error threshold at the 1% level when using surface codes, a standard error-correcting code. This threshold behavior is essential for scalable fault-tolerant quantum computing, as it ensures that logical error rates decrease as the system scales up.
"The most important result is that multi-qubit gates, favorable candidates for large scale quantum computation schemes, are also fully compatible and advantageous for fault tolerant codes," said Dr. Amit Ben-Kish, CTO and co-founder of Quantum Art. "For years, the quantum computing industry has largely focused on fault-tolerant systems built from vast numbers of sequential one- and two-qubit operations, leaving open questions about whether large multi-qubit gates could support the same path. Our analysis shows that the errors remain local and controlled, and that a practical threshold exists. That puts multi-qubit gates firmly in the fault-tolerant regime and provides a clear path for scaling such architectures."
The research also reveals that dominant noise sources from multi-qubit gates can be described as effective single- and two-qubit error channels, aligned with the gate's connectivity mapping. Unwanted long-range error propagation remains significantly weaker, ensuring that errors stay localized. This finding is crucial because it means the architecture can scale without introducing uncontrollable errors, supporting the requirements of fault-tolerant quantum computing.
Quantum Art's multi-qubit gate architecture offers advantages in computational efficiency, circuit compression, and hardware footprint. By enabling all-to-all connected multi-qubit gates, it reduces circuit depth and computational overhead by orders of magnitude compared to approaches relying solely on one- and two-qubit gates. The validated fault-tolerance threshold validates the company's roadmap toward large-scale systems, including its planned Perspective platform—a 1,000-qubit multi-core quantum computer designed to support commercially relevant applications with tens to hundreds of logical qubits—and the next-generation Landscape series, targeting thousands of logical qubits.
These results provide an important bridge between device-level physics and quantum error-correction performance, confirming that multi-qubit gates can support scalable fault-tolerant quantum computing. The paper is authored by O. Grossman, Y. Kadish, S. Gazit, A. Ben-Kish, R. Ozeri and Y. Shapira, and is available here.
