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.
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.
Grover and the Honest Speedup
Grover gives a quadratic speedup, and almost nobody can use it. Why AES survives the quantum era, what the halving figure means, and what…
The Impossible Coin
A device that randomizes once and un-randomizes twice, with no record anywhere. The quantum interference experiment that ends the hidden-value story.
The Classical Bit You Don’t Know Yet
Everything you believe about a bit you haven't looked at, made precise: definite values, probabilities as ignorance, and why mixing never un-mixes.
Quantum Amplitudes: The One New Rule
Quantum amplitudes for security professionals: probability-like numbers that go negative, the Born rule, and what superposition actually says.