A Working Map of Quantum Sensing
Quantum sensing covers everything from the caesium clock in a telecom rack to a laboratory radar proposal. Here is a map organised by what…
Where Trust Sits in a Quantum Network
Quantum key distribution moves the trust boundary rather than removing it. A working guide to trusted nodes, device-level attacks, and the questions to ask…
Distributing Entanglement Across a Network: A Design-Level Guide
Loss, fidelity, and memory coherence set the shape of every quantum network. A working guide to direct transmission, entanglement swapping, and purification, with the…
Crypto-Agility in Practice: A Design Guide for Architects
Crypto-agility is measured in how long a substitution takes and how much of the system it touches. Here is what that means at the…
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.
Correlations Without a Mechanism
Two qubits agree with certainty across any distance, and no message travels. Entanglement defined honestly, plus the 120-degree test gloves fail.