Quantum Computing
PostQuantum.com – Industry news and blog on Quantum Computing, Quantum Security, PQC, Post-Quantum, Quantum Tech
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Quantum Annealing’s Ideal Form Is the Gate Model in Disguise
A 2004 theorem says the idealized model behind quantum annealing and the gate model are one machine in disguise. Its proof freezes a computation at the bottom of an energy valley, and its fine print keeps annealers away from RSA.
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Helium-3 Alternatives: Every Exit From the Shortage, Assessed
Ten engineering escape routes and one geopolitical wildcard for quantum computing's scarcest input, from breeding tritium on purpose to cooling qubits from inside the chip. I assess what each can deliver, what blocks it, and what would change the answer.
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Nobody Understands Quantum Mechanics. Everybody Uses It.
A board member accused me of selling a technology nobody understands. He was half right. The interpretation of quantum mechanics is unresolved. The mathematics has been tested to twelve decimal places and runs your phone.
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Microsoft’s Majorana Qubit: What the Experts Actually Think
I've never trusted the Majorana story, but I'm no condensed-matter physicist. So after the latest chip and the latest Nature rebuttal, I went looking for where the experts, skeptics and defenders both, actually land.
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Quantum Snake Oil Is Flooding the News Cycle — and the Industry Is Letting It Happen
Three extraordinary quantum claims in two weeks, none peer-reviewed, all tied to commercial events. The quantum industry's credibility problem is accelerating, and the people paying the price are the enterprises trying to make real migration decisions.
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Every Quantum Salary Guide I’ve Seen Is Fake. Here’s How I Proved It.
Recruitment agencies are flooding the market with "benchmarked" quantum salary data. I reverse-engineered the numbers in five different guides. Every single one was built from a formula, not from actual placement data.
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The Quantum Utility Ladder: What Fault-Tolerant Quantum Computers Will Actually Be Used For
Most quantum computing coverage fixates on breaking encryption. The real near-term story is utility — chemistry, materials, energy, drug design. This article maps every major fault-tolerant quantum algorithm to its logical qubit requirements, T-gate costs, and the real-world problem it solves, from photosensitizer calculations at 350 qubits to bulk solid-state…
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The Narrow Advantage: Why Quantum Computing Will Transform Five Industries and Disappoint Twenty
After months of research and hundreds of papers, the picture is clear: quantum computing will deliver genuine competitive advantages for pharma, chemicals, batteries, advanced materials, and condensed-matter physics. For finance, logistics, and machine learning, the evidence is structurally weak. This capstone article synthesizes the full Quantum Utility Map series into…
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Quantum Computing by 2033: Which Industries Win, Which Wait, and Why
By 2033, fault-tolerant quantum computers with 2,000 logical qubits will create genuine competitive separation in pharma, chemicals, battery technology, and advanced materials. Finance, logistics, and machine learning face a structural barrier that no hardware improvement can fix. This strategic briefing maps the evidence and explains what to do about it.
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Quantum Snake Oil: A Field Guide to Misleading Quantum Technology Marketing
Over thirty terms. Two tracks. One field guide. The quantum technology market has the exact conditions that produce fraud in every emerging sector: high buzz, big money, low buyer literacy, and complex underlying science that most decision-makers cannot independently evaluate. This dictionary maps the terminology that CISOs, investors, and procurement…
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Why Scaling Logical Qubits Gets Exponentially Harder — And Which Walls Hit First
Vendor roadmaps imply smooth growth from 100 to 100,000 logical qubits. The reality is that specific engineering dimensions hit qualitative walls at each scale, and which wall dominates depends entirely on the hardware modality.
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The Error Correction Revolution: Why qLDPC Codes, Magic State Cultivation, and Algorithmic Fault Tolerance Are Rewriting the Quantum Timeline
Between 2024 and 2026, three error correction advances reduced the physical qubit cost of fault-tolerant quantum computing by an order of magnitude or more. qLDPC codes compress the encoding ratio. Magic state cultivation shrinks factory footprint. Algorithmic fault tolerance cuts runtime overhead by a factor of the code distance. Together,…
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Why Quantum Won’t Save Wall Street (Yet): An Honest Assessment of Quantum Computing in Finance
The best quantum finance resource estimates, produced by Goldman Sachs' own research team, require logical clock speeds three orders of magnitude beyond any projected hardware. The quantum speedup for derivative pricing and portfolio optimization is quadratic, and quadratic is structurally insufficient. Here is what the evidence says and what financial…
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The Decoder Bottleneck: The CRQC Challenge Nobody Is Talking About
Qubit count gets the headlines. Error rates get the analysis. But the classical decoder that must process millions of error signals per second in real time gets almost no attention outside the QEC research community. It may be the capability that determines the CRQC timeline.
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China’s Quantum Computing Hardware: The Core Capability the West Keeps Misjudging
The published record suggests China trails the US by about a year. The actual gap may be narrower — or it may already be closed. In December 2025, a team at the University of Science and Technology of China quietly posted a paper to Physical Review Letters demonstrating something only…
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