Quantinuum’s 99.9995% logical fidelity is about five logical errors per million error-correction cycles, measured on a distance-7 color code on Helios. This article covers what was measured, how the “10x” and “100x vs Google” claims compare, and what the result does not change.
Hadamard Matrix of Order 668 Found: What It Means for the Conjecture
On 12 August 2026, a 668×668 Hadamard matrix was announced, settling the smallest open case of the Hadamard conjecture after about 20 years. This article covers how it was checked, why the AI credit is still provisional, and what remains unsolved.
Aharonov-Bohm Effect Explained: 1959 Theory to Oxford’s 2026 Result
A charged particle can be affected by a magnetic field that is zero everywhere along its path. Here is how that prediction from 1959 was tested in 1960 and 1986, extended to gravity in 2022, and simulated on Oxford’s hybrid trapped-ion quantum computer in 2026.
GENIUS Act Effective Date: Jan 18, 2027 and What the OCC Rule Changes
The GENIUS Act takes effect on January 18, 2027, and the OCC’s final rule from October 21, 2026 does not change that date. Here is what the rule guarantees stablecoin holders, which parts are still unfinished, and what merchants accepting USDC should check.
Jacques Hadamard: Prime Numbers, Poincaré’s Seat and the H Gate
Jacques Hadamard (1865–1963) proved the prime number theorem in 1896, succeeded Poincaré at the Académie des Sciences and defined well-posed problems. Here is a carefully sourced account of his life that corrects errors repeated online.
E91 Protocol Explained: How Bell Tests Secure Quantum Keys
Artur Ekert’s 1991 E91 protocol turns entangled photon pairs and a Bell test into a shared secret key. This guide covers how it works, how it compares with BB84 and BBM92, and what experiments from Micius to 100 km device-independent QKD have shown.
Which Bitcoin Addresses Are Vulnerable to Quantum Computers?
Quantum computers threaten Bitcoin addresses whose public keys are visible on-chain, not the blockchain itself. This guide ranks P2PK, reused, Taproot and unspent hashed addresses by exposure and explains what you can do now.
Can Quantum Computers Break Ethereum? Risks, Qubits and the 2029 Plan
No quantum computer can break Ethereum today, but its elliptic-curve signatures have a known weakness and Google’s 2026 estimates moved the goalposts. Here is what is exposed, how many qubits an attack needs, and how Ethereum plans to be post-quantum by 2029.
EPR Paradox Explained: From Einstein’s 1935 Doubt to the 2022 Nobel
In 1935 Einstein, Podolsky and Rosen argued that quantum mechanics must be incomplete. This guide covers their argument, the replies, Bell’s theorem, the 2015 loophole-free Bell test, the 2022 Nobel Prize and why entanglement cannot carry messages.
Quantum Internet Explained: Repeaters, Teleportation, Real Links
A quantum internet distributes entanglement between distant nodes. It is not a faster internet. Here is how repeaters, teleportation and deployed-fiber links actually work, what has been demonstrated by 2026, and why it does not replace post-quantum cryptography.