Latest Quantum Research & Methods News
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May- 2026 -16 MayResearch
Jiuzhang 4.0: China’s 1,024-Input Photonic Processor Claims 10⁵⁴ Speedup
Pan Jian-Wei's team published a rigorous Nature paper showing an order-of-magnitude leap in photonic quantum scale. The engineering is impressive. The "quantum supremacy" framing from state media is a different matter entirely.
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13 MayResearch
Theorists Prove Passive Quantum Memory Works in Three Dimensions, Settling a 25-Year-Old Question
A Caltech–UCSD team has constructed a 3D quantum system that can store a qubit for exponential time without active error correction. The result settles a question that has resisted the field's best efforts for a quarter century.
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6 MayIndustry
Q-CTRL Achieves Practical Quantum Advantage — and the Business Signal May Be Bigger Than the Physics
Q-CTRL's 120-qubit simulation of the Fermi-Hubbard model achieves quantitative accuracy matching classical benchmarks while completing in minutes rather than days. The "practical quantum advantage" claim deserves scrutiny, but the underlying technical achievement is real.
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2 MayResearch
IBM’s Quantum Advantage Claim: What the Heron-Fugaku Experiment Actually Shows
IBM says quantum advantage arrives in 2026. A new Heron-Fugaku experiment provides the evidence. Whether it proves the claim depends on how you define “advantage.”
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Apr- 2026 -23 AprilResearch
IonQ Publishes Complete Fault-Tolerant Blueprint for Trapped Ions “The Walking Cat Architecture”
IonQ's 110-page preprint details a complete fault-tolerant quantum computer architecture built entirely on qLDPC codes. The numbers are impressive, but every claim rests on hardware that doesn't yet exist at scale.
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21 AprilResearch
Nature Reviews Publishes the Definitive CMOS–Spin Qubit Compatibility Assessment
A comprehensive review from Dzurak's team maps exactly where silicon spin qubits align with existing CMOS manufacturing — and where they diverge. The implications for scaling to millions of qubits are more nuanced than the headlines suggest.
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20 AprilResearch
QuEra Achieves 2:1 Physical-to-Logical Qubit Ratio With Ultra-High-Rate qLDPC Codes
A QuEra–Harvard–MIT collaboration demonstrates qLDPC codes that encode more logical qubits than they consume in overhead — a 2:1 physical-to-logical ratio that enters the Teraquop regime. This is a simulation result, not an experiment. But if it holds up, it rewrites the economics of fault-tolerant quantum computing.
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11 AprilResearch
Harvard’s Cascade Neural Decoder Cuts Quantum Error Rates 17×, Reveals Waterfall Effect
Harvard's Cascade decoder achieves logical error rates 17× below the best existing decoders on quantum LDPC codes and reveals a "waterfall" regime of error suppression that could reduce the physical qubit count required for a CRQC by 40% or more.
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9 AprilQuantum Security & PQC
Architecture Matters as Much as the Algorithm: Q-CTRL’s Heterogeneous Quantum Computer Design Cuts RSA-2048 to 190k-381k Qubits
9 Apr 2026 - Researchers at Q-CTRL, a quantum infrastructure software company headquartered in Los Angeles and Sydney, have published a paper introducing Q-NEXUS, a heterogeneous quantum computing architecture that claims to reduce the physical qubit requirements for factoring 2048-bit RSA integers to as few as 190,000 physical qubits — a roughly 4.7× reduction from the current monolithic baseline. The…
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5 AprilResearch
QuiX Quantum Achieves First Below-Threshold Error Mitigation in Photonic Quantum Computing
5 Apr 2026 - QuiX Quantum, a Netherlands-based photonic quantum computing company, announced it has demonstrated below-threshold error mitigation on a photonic quantum computer for the first time, in collaboration with NASA's Quantum Artificial Intelligence Laboratory (QuAIL), the University of Twente, and Freie Universität Berlin. The result, described in a pre-print on arXiv currently undergoing peer review, demonstrates a technique…
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3 AprilResearch
Gauge Theory Meets Quantum Computing
April 2, 2026 - Dr. Dominic Williamson of the University of Sydney and Theodore Yoder of IBM have published a new method for performing fault-tolerant logical measurements on quantum error-correcting codes that dramatically reduces the physical qubit overhead required. The paper, titled "Low-overhead fault-tolerant quantum computation by gauging logical operators", appears in Nature Physics (DOI: 10.1038/s41567-026-03220-8). The technique treats logical…
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Mar- 2026 -31 MarchQuantum Security & PQC
10,000 Qubits to Run Shor’s Algorithm
31 Mar 2026 - On the same day that Google Quantum AI published its landmark ECDLP-256 resource estimates showing fewer than 500,000 superconducting qubits could break cryptocurrency cryptography in minutes, a team from Oratomic, Caltech, and UC Berkeley quietly dropped a paper making an even more startling claim about qubit count: Shor's algorithm can be executed at cryptographically relevant scales…
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31 MarchQuantum Security & PQC
Google Quantum AI Achieves 10x Reduction in Resources to Break Bitcoin’s Cryptography
31 Mar 2026 - Google Quantum AI has published a 57-page whitepaper demonstrating that the quantum resources needed to break the elliptic curve cryptography protecting Bitcoin, Ethereum, and virtually every major cryptocurrency are roughly an order of magnitude smaller than previously estimated. The paper, titled "Securing Elliptic Curve Cryptocurrencies against Quantum Vulnerabilities: Resource Estimates and Mitigations" and co-authored with researchers…
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24 MarchResearch
Silicon Crosses the Logical Threshold: First Universal Logical Operations Demonstrated in a Silicon Quantum Processor
24 Mar 2026 - In 1998, Bruce Kane published a single-page proposal in Nature that launched an entire subfield of quantum computing. The idea was elegant: use the nuclear spins of individual phosphorus atoms embedded in a silicon crystal as qubits. Silicon offered long coherence times. Phosphorus offered an addressable spin. And the surrounding semiconductor infrastructure — the lithography, the…
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21 MarchResearch
The 1,000-Qubit Ceiling That Probably Isn’t
21 Mar 2026 - A curious thing happened in cybersecurity Slack channels and LinkedIn threads over the last few weeks: security professionals who had been dragging their feet on post-quantum cryptography migration suddenly had a new reason to wait. A paper published in the Proceedings of the National Academy of Sciences by Tim Palmer, an emeritus professor of physics at…
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