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Level 0

Math Foundations

The minimum math toolkit to truly understand what follows. Optional, but recommended if you want the full picture.

Level 1

Foundations

Start here if you're completely new to quantum computing.

Level 2

Core Principles

The quantum phenomena that make quantum computing possible.

Level 3

Algorithms

The algorithms that give quantum computers their power.

Level 4

Hardware & Error Correction

How real quantum computers are built and made reliable.

Level 5

Advanced Topics

Deeper theory and the path toward fault-tolerant quantum computing.

Level 6

Practitioner's Corner

Hands-on guidance for actually writing and running quantum code.

Level 7

Capstone Topics

Bringing it all together — full lessons on the field's signature applications, and a way to test what you've learned.

1994 (published in full in 1997)

Shor's Algorithm

Factors large numbers exponentially faster than any known classical algorithm, threatening RSA encryption.

1996 (conference); 1997 (journal)

Grover's Algorithm

Searches unsorted data in roughly √N steps instead of N, using amplitude amplification.

1992 (Deutsch's original 1985)

Deutsch-Jozsa Algorithm

The first algorithm to prove a quantum computer could solve a problem exponentially faster than any classical deterministic algorithm.

1994

Simon's Algorithm

Finds a hidden pattern (period) in a function exponentially faster than classical methods, directly inspiring Shor's Algorithm.

Qubit

The basic unit of quantum information, capable of existing in a superposition of 0 and 1.

Entanglement

A quantum phenomenon where two or more qubits become linked, so the state of one instantly correlates with the state of another.

Superposition

The quantum principle that a qubit can exist in a combination of 0 and 1 simultaneously, until it is measured.

Quantum Gate

A basic operation applied to qubits that transforms their quantum state — the quantum equivalent of a classical logic gate.

Bloch Sphere

A geometric representation of a single qubit's state as a point on the surface of a sphere.

Decoherence

The process by which a qubit loses its quantum properties through unwanted interactions with its environment.