Volume III · Computing

Physics is the substrate. This is the computer: registers, oracles, Grover, the fridge.

Physics is the substrate. Computing is the program: a register of amplitudes, a reversible instruction set, oracles, then Grover — search by rotating toward the marked item.

Start with registers Skip to Grover

In English

Volume II is the physics. This volume is the computer: many qubits as memory, reversible instructions, a search trick (Grover), a teleport, and the fridge the whole stack sits in.

Try this: If superposition is still foggy, go back to Volume II. Otherwise start at Registers.
Keep this: A quantum computer is a programmable box of amplitudes, with a very grumpy fridge.

The stack · click a layer

What this is

A 1-, 2-, and 3-qubit state-vector you can program: reversible gates, kickback, Grover, teleportation, a toy QFT. The stack chapter is the fridge around it.

What this is not

Not a hardware emulator and not Qiskit. Deutsch lives in Volume II. This volume is the computer you build on that physics — algorithms plus the machine that has to run them.