Quobly Demonstrates Quantum Gates on 300 mm Silicon Chip
Quobly, formerly Siquance, a French company developing silicon spin qubits, announced on September 16, 2026, that it has successfully performed qubit readout, a single-qubit gate, and a two-qubit gate on a single chip. This chip came to be through the deployment of STMicroelectronics’ commercial 300 mm FD-SOI process in Crolles, France.
What Quobly Demonstrated
According to Quobly’s own newsroom, the team executed the three fundamental operations for a silicon spin-qubit machine on a single chip from Quobly’s proprietary QSOI platform. These devices were produced using STMicroelectronics’ 300 mm FD-SOI CMOS line, the same industrial process used for mainstream chip manufacturing.
Chief Scientific Officer Tristan Meunier described the achievement as “an important step” that “validates key elements of the technology transfer.” Quobly also stated it co-integrated quantum and cryogenic circuits on the same chip and developed a cryogenic process design kit. Quantum Computing Report corroborates the single-chip readout and gate claims. The company indicated it would publish detailed performance metrics in a future scientific paper.
What the Demonstration Doesn’t Show
The announcement lacks crucial figures needed to assess the hardware’s practical utility. Quobly has not disclosed the qubit count, gate fidelities, coherence times, or readout accuracy, nor has it specified the number of repetitions of the operations.
It remains unclear whether the team performed these operations on a complete processor or on separate test structures, and what’s the usable qubit yield across a wafer. As of now, there is no peer-reviewed publication or independent researcher commentary available. Running gates on a 300 mm wafer does not confirm that the process can consistently produce identical qubits at scale, nor does it establish quantum advantage.
This development does not imply fault-tolerant computing, commercial deployment, or a cryptographically relevant quantum computer, none of which currently exist.
This result aligns with other industry advancements in software and control, such as Fujitsu open-sourcing a quantum application package and the collaboration between Altera and Riverlane on real-time error correction. These address different challenges than fabrication and do not alter the scope of Quobly’s measurements.
Quobly plans to offer cloud access to its first system, Alloy Pioneer, by the end of 2026, with a long-term goal of achieving one million qubits by 2032. These are roadmap targets, not currently available products. Further meaningful evidence would include qubit counts, gate fidelities, coherence data, repeated benchmarks, peer review, and access to the device itself.