Wire Ranges

Registers are how you tell Qubi which qubits a gate touches. Most forms accept arithmetic - not just literal integers.

Form	Meaning	Example
`N`	Single wire index (integer, variable, or expression)	`0, num, sqrt(9), visiblemax-1`
`all`	Every allocated wire (0 through max)	`H all`
`visible`	Every visible wire (0 through visiblemax)	`H visible`
`max`	Last allocated wire index	`12 qubits → max is 11`
`visiblemax`	Last visible wire index	`3 visible rows → visiblemax is 2`
`A..B`	Inclusive range; endpoints can be expressions	`0..3, 1..visiblemax`
`A..max`	Range through last allocated wire	`0..max`
`A..visiblemax`	Range through last visible wire	`0..visiblemax`
`A.S.E`	Stepped list (start.step.end); start, step, and end may be integers, variables, max, visiblemax, or expressions; step may be negative	`0.2.6; visiblemax.-1.0; 0.coffee.max; max.step.0`
`A.S.max`	Step through last allocated wire	`0.2.max`
`A.S.visiblemax`	Step through last visible wire	`0.2.visiblemax`
`(a,b,c)`	Explicit parallel list; items can be expressions	`H (0, visiblemax, sqrt(4))`
`[a,b,…]`	Joint multi-qubit register	`CX [0,1], CX ([0,1],[2,3])`

Parallel lists with math

H (0, 1, visiblemax)
RX (0..visiblemax) 0.5
H 0.2.visiblemax     // stepped: 0, 2, 4, … up to visiblemax
H visiblemax.-1.0    // stepped down from visiblemax to 0
H max.-1.visiblemax  // stepped from max down to visiblemax
H (max.-2.0)         // parenthesized parallel stepped list
X (0.coffee.max)     // step may be a variable (coffee = 3)

Parallel controlled gates

Two bracket groups on one line apply the same gate to multiple control/target pairs in parallel:

CX ([0,1],[2,3])   // CNOT on (0→2) and (1→3) in one column (when scheduling allows)