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 organized 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…
Entanglement-Based QKD: How E91 and BBM92 Actually Work
E91 and BBM92 both distribute entangled photon pairs, but they verify security in completely different ways. That difference decides what you have to trust.
FIPS 140 and What Validation Actually Certifies
A FIPS 140 certificate names one module, one version, one tested environment and one mode of operation. Here is how to read one, and…
BB84 Explained: How Quantum Key Distribution Actually Works
Bennett and Brassard's 1984 protocol turns key distribution into a physics problem. Here is the mechanism, the eavesdropper maths, and the four things BB84…
Q-Day and Y2K: What the Comparison Gets Right
The Y2K analogy is useful for justifying the budget and misleading about the schedule. Here is which half of it to keep.
What Quantum Computing Actually Is
The 'tries every answer at once' story is wrong, and it leads to the wrong investments. A plain account of qubits, interference, and the…
Inside ITU-T Y.3800: The Reference Model for QKD Networks
ITU-T Y.3800 turned quantum key distribution from a point-to-point demonstration into a network architecture. What its four layers define, and what they leave open.