Learn: the curriculum
An ordered path, not a blog archive. It starts with linear-algebra intuition, the actual prerequisite most resources skip, and ends with what quantum computers provably cannot do. Prerequisites are shown; your position is tracked in your browser.
Filled markers are steps your tracked progress has passed; the outlined ring is where you are now. Arrows show prerequisites. Tap any step to jump to it.
Linear algebra intuition
Vectors, bases, matrices as transformations, and tensor products. The ACTUAL prerequisite for quantum computing, which most resources skip.
Tomasz Kawalec · CC BY-SA 4.0 ↗
Qubits and superposition
From the definite bit to the amplitude-carrying qubit. Why '0 and 1 at the same time' is a shortcut, not the truth.
Prerequisites: linear algebra intuition
Measurement
One classical outcome per shot; the distribution is the output. Why looking changes things, and why algorithms repeat.
Prerequisites: qubits superposition
Entanglement
Joint structure no independent description reproduces: a resource, not a faster-than-light telephone.
Prerequisites: measurement
NIST · Public domain ↗
Gates and circuits
X, Z, H, rotations and CNOT; circuits as time-ordered choreography; why compilation to real hardware changes everything.
Prerequisites: qubits superposition
A. Tonomura / Belsazar · CC BY-SA 3.0 ↗
Interference: the actual source of advantage
Wrong answers cancel, right answers reinforce. The one-sentence truth of quantum speedup lives here.
Prerequisites: gates circuits
The major algorithms
Deutsch-Jozsa for intuition, Grover for search, Shor for cryptography: each with its honest reality check.
Prerequisites: interference
Decoherence and noise
Why qubits are divas, what T1/T2 mean, and why the useful life of quantum information is finite.
Prerequisites: gates circuits
Error correction and logical qubits
Many noisy physical qubits become one dependable logical qubit, and 'below threshold' becomes the field's honest scoreboard.
Prerequisites: decoherence noise
What quantum computers provably cannot do
The most common misconception in the field, treated head-on: quantum computers do NOT try all answers in parallel. Interference is the mechanism.
Prerequisites: interference, major algorithms
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