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Quantum Computing
Fidelity in Quantum Computing: The Nines That Decide Q-Day
The best single-qubit gate now fails once in 6.7 million operations. The best two-qubit gates fail a thousand times more often. That gap, counted in nines, sets the pace of fault tolerance and every serious Q-Day estimate.
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Post-Quantum, PQC, Quantum Security
Why Europe Is Industrialising CV-QKD
QUARTERNEXT places CV-QKD at the centre of one European industrialisation track. EuroQCI remains deliberately multi-protocol. The real story is how telecom integration, certification, and supply-chain control shape the portfolio.
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Quantum Security & PQC
ECC Attack Circuit Drops to 835 Logical Qubits
The same Tsinghua-Peking group whose April preprint reached 1,333 qubits for a 256-bit ECC attack has pushed to 835, the lowest yet. The circuit is narrower, but the gate count is 20 times higher than the leading alternative. Smaller machine,…
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Quantum Snake Oil
Quantum Washing: The Quantum Industry’s Credibility Tax
Greenwashing had a decade-long head start and its own SEC enforcement playbook before the quantum industry caught up. Quantum washing is following the same arc, faster, because the underlying science is harder for outsiders to evaluate.
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Quantum Snake Oil
Post-Selection Laundering
When a vendor reports "zero errors" on a quantum computation, the first question is: how much data did they throw away to get there? Filtering bad results is a real technique. Calling it fault tolerance is a different thing.
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Quantum Snake Oil
Circular Validation / Answer-Smuggling
If a quantum circuit's rotation angles are derived from a classical solution of the same problem, the quantum computer is confirming a known answer, not discovering one. This pattern appears in claims of quantum computational advantage.
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Quantum Snake Oil
Engineered Signature as Evidence
Designing a system to force all inputs to the same output, then presenting that output as proof the system works, is circular reasoning. This pattern appears in quantum computing claims and beyond.
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Quantum Snake Oil
Software-Defined Fault Tolerance
When a vendor claims their software eliminates the qubit overhead of quantum error correction, they are claiming that a proven mathematical requirement of quantum information theory does not apply to them. It does.
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Quantum Computing
McKinsey’s $600 Billion Quantum Finance Number Doesn’t Add Up. Literally.
McKinsey's Quantum Technology Monitor puts quantum computing's finance value at 400 to 600 billion USD by 2035. The disclosed arithmetic ignores its own assumptions, merges AI with quantum, and is never reconciled with published resource estimates. I checked.
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Post-Quantum, PQC, Quantum Security
How Much Can AI Help With PQC Migration?
AI is already part of PQC migration, and it helps. But the claim that frontier models compress enterprise timelines from 15 years to four confuses which part of the program AI accelerates and which part it cannot touch.
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Quantum Sovereignty
Every US Quantum Computer Runs on Foreign Parts and Foreign Inventions
The U.S. quantum community keeps saying America built every layer of the quantum stack. I tested that claim against the historical record, layer by layer, from theory through cryogenics. The answer has direct implications for supply chain policy and alliance…
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Industry
White House Quantum Summit Operationalizes June EOs
The White House convened nearly 100 government officials, quantum company executives, and researchers on July 7 to translate June's twin quantum executive orders into coordinated action, with a 2028 fault-tolerant computing target and 2030 PQC migration deadline anchoring the agenda.
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Post-Quantum, PQC, Quantum Security
You Cannot Detect Harvest Now, Decrypt Later (HNDL)
Vendors are beginning to sell HNDL detection. Boards are asking for proof of HNDL targeting. Neither is possible. Passive collection leaves no observable event inside your network. The defense is encryption, not detection.
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Quantum Commercialization
Quantum’s SPAC Gold Rush: The 2021 Class Promised $1.2 Billion and Delivered $138 Million
The first quantum SPAC class projected $1.2 billion in 2025 revenue and delivered $138 million. Five more companies have listed through SPACs since January, with at least six queued. I read the new wave against that scoreboard.
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Industry
Shanghai Bets on Neutral Atoms with Dual Quantum Hubs
Shanghai launched two quantum computing hubs in a single week, both targeting neutral-atom quantum computing. The move validates two things I have been arguing for months: China's 15th Five-Year Plan is implementing fast, and neutral atoms are the modality to…
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