Quantum Computing
PostQuantum.com – Industry news and blog on Quantum Computing, Quantum Security, PQC, Post-Quantum, Quantum Tech
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Factoring RSA-2048 in 20 Minutes with 42 Qubits
We present a resource estimate for factoring 2048-bit RSA integers using a quantum computer with just 42 physical qubits and a runtime of approximately 20 minutes. Our approach combines well-established results from the recent literature: Regev's O(n3/2) quantum factoring algorithm [1], asymptotically optimal qLDPC codes at their proven constant encoding…
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What 60+ Quantum Hardware Roadmaps Actually Tell Us
What do 60+ quantum hardware roadmaps tell us when you read them together instead of one at a time? This capstone article synthesizes the quantum computing company landscape into strategic insight: which modalities have the most commercial momentum, where the industry's centre of gravity sits geographically, how roadmap promises compare…
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The Easiest Job in Quantum Computing – Being a Cynic
Don’t mistake the noise of cynicism for the signal of intelligence. If someone validates themselves as a useless cynic - unwilling to provide anything beyond scoffs and derision - don’t waste your energy getting dragged into their performative pessimism. Instead, direct your attention to the genuine skeptics and curious contrarians who…
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Why Companies May Need a Chief Quantum Officer (CQO)
In my opinion, forward-thinking organizations should consider creating a Chief Quantum Officer (CQO) role. Much like those historical electricity executives, a CQO would spearhead the adoption of a disruptive technology that is revolutionary, promising - but widely misunderstood. It’s a provocative idea (even “a job title from Star Trek,” as…
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Magic States: A Key to Universal Fault-Tolerant Quantum Computing
Magic states are special quantum states that enable the universal operations needed for any quantum algorithm, yet which are not themselves easy to produce or protect. In essence, magic states supply the "extra quantum sauce" that elevates a protected quantum computer from what could be emulated on a classical computer…
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The Nervous System of Quantum Computing: A Deep Dive into Quantum Control Systems
In July 2025, Keysight Technologies shipped a piece of equipment to a research institute in Tsukuba, Japan, that most people outside the quantum industry had never heard of - yet without it, the 1,000-qubit quantum computer it was destined for would have been little more than an extraordinarily expensive refrigerator.…
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What It Will Actually Cost to Break RSA-2048: Energy, Hardware, People, and the Bill Nobody’s Talking About
Breaking one RSA-2048 key on a CRQC could cost $2–5 million when you add up energy, amortization, personnel, and facilities All three approaches share silicon's core advantages: compatibility with semiconductor industry infrastructure, small qubit footprint (~50 nm), and long coherence times enabled by isotopic purification of ²⁸Si. But they diverge…
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Quantum Winter Warning: Why Overhype and the QCI Saga Could Chill Quantum Computing
The saga of Quantum Computing Inc. is a stark illustration of what happens when hype becomes unmoored from truth. If the quantum field falls into the trap of overselling and under-delivering, we will hand ammunition to detractors and possibly induce the very “quantum winter” we all want to avoid. Investors…
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The Many Faces of Decoherence
Quantum computers hold enormous promise, but they face a stubborn adversary: decoherence. This is the process by which a qubit’s fragile quantum state (its superposition or entanglement) leaks into the environment and effectively "forgets" the information it was carrying. For today’s leading quantum hardware modalities – superconducting circuits, trapped-ion qubits,…
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What Quantum Computers Can Do Better Than Classical Computers
Quantum computers already outperform classical computers on a few specialized tasks, and over the coming years that list of tasks will grow. They excel at problems where superposition and entanglement let them explore a vast landscape of possibilities in parallel and use interference to extract an answer – factoring numbers,…
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The Rise of Logical Qubits: How Quantum Computers Fight Errors
Logical qubits are the linchpin for delivering on the promise of quantum computing. They are the qubits as we wish we had them – long-lived and trustworthy – brought to life by the ingenuity of quantum error correction. By encoding information across many imperfect qubits, scientists have shown they can…
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Why I Founded Applied Quantum – The First Pure-Play, End-to-End Quantum Consultancy
Applied Quantum is a firm that for the first time would be 100% dedicated to quantum technology services – not as a sideline, not as one emerging tech practice among many, but as the entire mission of the company, and it would cover the field end-to-end. We founded Applied Quantum…
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Quantum Programming: An In-Depth Introduction and Framework Comparison
Quantum programming is an emerging discipline that challenges developers to think beyond classical bits and deterministic algorithms. Instead of manipulating binary 0s and 1s, quantum programmers work with qubits that can exist in multiple states at once and harness phenomena like superposition and entanglement to perform computations in fundamentally new…
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How Quantum Could Break Through Amdahl’s Law and Computing’s Limits
Amdahl’s Law teaches us a humbling lesson about the limits of classical computing: there is always a portion that resists parallel speedup, chaining us to diminishing returns. We’ve coped by clever engineering – making that chain as short as possible – but not broken it. Quantum computing offers a bolt…
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Quantum Technologies and Quantum Computing in South Korea
South Korea’s quantum technology ecosystem has rapidly matured from obscurity into a well-organized force. Backed by a clear national strategy and increasing investments, Korea is making its mark through cutting-edge research at top universities, substantial government support for quantum computing and communications, and active participation from industry giants and startups…
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