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Quantum ComputingAN INTERACTIVE OPEN TEXTBOOK
charithj.com.au

A book for the quantum curious.Open access. Open possibilities. ↗

LEARN · VISUALISE · EXPERIMENT

A clearer path into
quantum computing.

Big ideas, made approachable. An interactive guide that takes you from your first qubit to the frontiers of quantum computing, one experiment at a time.

A LITTLE QUANTUM INTUITION01 / QUBIT
+x+y+z|0⟩|1⟩|ψ⟩
PREVIEW · PREPARED |+⟩ AT RESETP(0) = 50.0% · P(1) = 50.0%
Try a gate

Explore the preview, then make predictions in the lesson labs.

A DIFFERENT WAY OF THINKING.
01 No physics prerequisite02 Learn through experiments03 Move at your own pace04 Free, without a login

ONE BOOK. MANY WAYS IN.

Find your next idea.

View the full contents ↗

Start with the foundations or follow your curiosity. Every pathway is open.

Explore 26 foundation lessons, 40 algorithm chapters and 30 atlas topics, with worked diagrams and checked practice. Further volumes are mapped in the 170-chapter roadmap.

LESS SCROLLING. MORE DISCOVERY.

Don’t just read it.
Try it.

Turn a gate. Change a phase. Watch the probabilities shift. Our small, focused experiments make abstract ideas something you can investigate.

Enter the experiment studio →

Runs entirely in your browser. No installs. No cloud credits.

L03 / INTERFERENCEIdeal-state model
|0⟩HZHM
|0⟩
0%|1⟩
100%

Same probabilities in the middle.
A completely different outcome at the end.

Find out why →

YOUR CURIOSITY. YOUR ROUTE.

You don’t have to
learn it all at once.

A gentle beginning, a software perspective or a mathematical deep dive. Choose the route that fits where you are.

Find your pathway ↗
  1. 01
    I’m completely new to quantum →

    Start with the ideas. Build confidence as you go.

  2. 02
    I think in code →

    Connect familiar software concepts to quantum workflows.

  3. 03
    I want to go deeper →

    Follow the mathematics, assumptions and evidence.

THE FIRST STEP IS SMALL.

Your first qubit is waiting.

Let’s explore it →