Where Post-Quantum Cryptography and Quantum AI Actually Meet
Four different technologies share the label 'quantum AI'. Only one of them is already breaking post-quantum implementations, and it is not the quantum one.
The DiVincenzo Criteria and What They Screen Out
David DiVincenzo's seven requirements were written to stop a specific over-claim. A quarter-century later they still screen architectures, and they still refuse to rank…
A Map of Quantum Computing Modalities
Qubit counts are not comparable across platforms. A framework that separates the computational models from the physical carriers, and identifies which numbers actually differentiate…
How Quantum Error Correction Actually Works
Bit flips, phase flips, stabilizers, thresholds and the arithmetic behind million-qubit roadmaps. A ground-up walkthrough of quantum error correction for engineers.
What a Quantum Computer Is Not
Part 1 of a no-hype quantum computer intro for security professionals: the category error, what breaks, what survives, and your real deadline.
Vast State, Narrow Door
Three hundred qubits hold more amplitudes than the universe has atoms; one measurement pays out 300 bits. Holevo, no-cloning, and the myth's end.
Shor: Cryptanalysis by Physics
Shor's algorithm breaks RSA by turning factoring into period-finding, then reading the period with interference. The mechanism, and what it takes.
The Machine Itself
Why the headline qubit count misleads: decoherence, error correction that never reads your data, and the gap between today's hardware and a CRQC.
The Shape of a Quantum Algorithm
Every quantum algorithm is 4 moves: prepare, imprint, interfere, measure. A one-qubit worked example, and why only structured problems pay out.
Reading the Field Like a Professional
The tripwires that would actually change your migration timeline, the announcements that never will, and why your deadline was never Q-Day.