Quantum Computing
PostQuantum.com – Industry news and blog on Quantum Computing, Quantum Security, PQC, Post-Quantum, Quantum Tech
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Analysis of Quantinuum Helios, a 98‑Qubit Trapped‑Ion Quantum Computer
In November 2025, Quantinuum unveiled Helios, a new 98-qubit quantum processor that pushes the frontier of quantum computing with a novel trapped-ion architecture. It also published an accompanying paper on arXiv "Helios: A 98-qubit trapped-ion quantum computer." Helios is based on the quantum charge-coupled device (QCCD) design, meaning it physically…
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Predicting Quantum Computing Winning 2025 Nobel Physics Prize
Announcements of 2025 Nobel Prize winners start tomorrow. With announcements for Nobel Prize for Physics scheduled for Tuesday 7 October. Every autumn I indulge in a guilty pleasure: browsing speculative lists of Nobel Prize contenders and trying to guess who might pick up the world’s most coveted science prize. Part…
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Quantum MedBeds and Death Threats
I never write about current politics. This might be my first on this blog. In fact, for the sake of my own sanity, I’ve made a point of steering this blog and most of my day clear of politics and the daily chaos of partisan news. I prefer to focus…
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Cisco’s Full-Stack Approach and the Road to Quantum Data Centers
Cisco took on an ambitious full-stack strategy to make distributed quantum computing a reality sooner than many expect. Instead of waiting for a single perfect quantum processor with millions of qubits, Cisco is building the hardware, software, and architecture needed to network today’s smaller quantum machines into unified quantum data…
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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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How Shor’s Algorithm Actually Works, Explained from Scratch
How does a quantum computer factor a number that would take every classical computer longer than the age of the universe? A step-by-step walkthrough with no prerequisites beyond multiplication.
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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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