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The Qubi Course

Learn quantum here.

A free course that explains quantum computing step-by-step.

Get your model qubits→Browse all guides

Chapter 1

Fundamentals

  1. 1.1

    What is quantum?

    6 min
    →
  2. 1.2

    What is a qubit?

    6 min
    →
  3. 1.3

    The math behind a qubit

    10 min
    →
  4. 1.4

    What is quantum entanglement?

    8 min
    →
  5. 1.5

    No-signaling

    7 min
    →

Chapter 2

Experiments and Paradoxes

  1. 2.1

    The Bell Paradox

    5 min
    →
  2. 2.2

    BB84: how to share a quantum secret

    12 min
    →
  3. 2.3

    Ekert91 (E91)

    6 min
    →
  4. 2.4

    Superdense coding

    Coming soon
  5. 2.5

    Impossibility of quantum bit commitment

    7 min
    →

Chapter 3

Quantum Computing

  1. 3.1

    What can quantum computing do?

    7 min
    →
  2. 3.2

    Deutsch's algorithm

    Coming soon
  3. 3.3

    What is a quantum gate?

    6 min
    →
  4. 3.4

    What is fidelity?

    5 min
    →
  5. 3.5

    Grover's algorithm

    Coming soon

Concepts & reference

Gates, operations, and the glossary

Short visual explainers for each gate (one interactive Bloch-sphere demo each), plus the operations reference and the glossary of quantum-computing terms.

  • Hadamard gate

    Puts a qubit into superposition. The most-used gate in quantum computing.

  • Pauli-X gate

    The quantum NOT. Flips |0⟩ ↔ |1⟩.

  • Pauli-Y gate

    A 180° rotation about the y-axis with an added phase.

  • Pauli-Z gate

    The phase flip. Invisible in the z-basis.

  • T gate

    A 45° phase rotation. The third gate in the universal set.

  • CNOT gate

    Two-qubit gate that creates entanglement. A quantum if-statement.

  • Quantum measurement

    Collapses a qubit to one of two outcomes along the axis you pick.

  • Glossary

    Plain-language definitions for the terms you keep running into.

Read the course. Then hold the qubits.

Get your model qubits→
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