Quantum Litmus — The Daily Reality Check for Quantum Computing
Independent, evidence-first analysis of what changed in quantum computing today, why it matters, and what the evidence does not yet show.
Quobly and ST report single-electron detection across a 300 mm silicon wafer
New measurements put numbers behind the manufacturing effort. The 69% test success rate is not the yield of working qubits or processors.
Today’s top signal
Quobly and ST report successful first-electron detection in 377 of 546 tested configurations across 91 chip locations.
In plain English
Quobly and STMicroelectronics have published new measurements from their industrial silicon process. In a September 17 preprint, the team detected the first electron in 377 of 546 tested configurations across 91 chip locations on a 300 mm wafer—a 69% success rate.
Why this matters: this adds quantified manufacturing evidence beyond yesterday’s announcement of quantum operations. More consistent devices could make calibration easier and help engineers reproduce larger arrays.
The boundary is important: 69% describes a charge-detection test, not working-qubit or finished-processor yield. The study selected promising process variants for cold testing. It does not establish production-wide consistency, gate accuracy, useful computation or customer economics. It is company-authored research awaiting independent reproduction.
Other teams already have wafer-scale and silicon-gate results. Intel published wafer probing in 2024, while imec and Diraq reported measured gates in July 2026. Their tests are different; the percentages cannot be ranked as one league table.
The next proof is to connect reproducible fabrication with reliable quantum operations across many devices and complete systems. Until then, this is component-manufacturing progress, not commercial readiness.
Why this matters: this adds quantified manufacturing evidence beyond yesterday’s announcement of quantum operations. More consistent devices could make calibration easier and help engineers reproduce larger arrays.
The boundary is important: 69% describes a charge-detection test, not working-qubit or finished-processor yield. The study selected promising process variants for cold testing. It does not establish production-wide consistency, gate accuracy, useful computation or customer economics. It is company-authored research awaiting independent reproduction.
Other teams already have wafer-scale and silicon-gate results. Intel published wafer probing in 2024, while imec and Diraq reported measured gates in July 2026. Their tests are different; the percentages cannot be ranked as one league table.
The next proof is to connect reproducible fabrication with reliable quantum operations across many devices and complete systems. Until then, this is component-manufacturing progress, not commercial readiness.
Quantum Litmus assessmentMONITOR
Commercial Readiness Outlook — Industry
Early
Estimated broad enterprise window: 2030–2033
Today: What moved: quantified wafer-test evidence now complements the industrial-process announcement. What did not move: demonstrated useful computing or customer economics. The 2030–2033 window is unchanged.