Learn

Six short lessons. Start anywhere, or follow the course in order.

No equations or account required. Each lesson has an example, a diagram and a self-check.

Learn · Foundations

Start with bits, instructions and the difference between information and machinery.

Learn · Foundations

A quantum state changes how outcomes are produced. Measurement still gives a specific outcome.

Learn · Foundations

Quantum operations change amplitudes before measurement changes them into outcome probabilities.

Learn · Foundations

Sometimes a joint quantum state cannot be described as independent states for its parts.

Learn · Hardware

Protecting quantum information requires more than adding a second copy.

Learn · Research

Ask what was measured, against which alternative, and what the result does not establish.