WIP: More gates, layout tweaks

[hornc]

I'm getting a feel now for how the layouts are constructed.

These build on #6, and this is me experimenting with how the layouts work.

• This adds some more controlled gate footprints
• sets the default page size to A4 to fix the squashed frame, and confirmed it works sensibly with other page sizes (A3, and custom x, y sizes)

I've been testing with this circuit:

OPENQASM 2.0;
include "qelib1.inc";
h(1);
i(2);
i(3);
cx 1,2;
cy 1,3;
ch 2,3;
measure 1 -> 1;
measure 2 -> 2;
measure 3 -> 3;

Which produces this:

CY and CH are not built in OPENQASM 2.0 statements (but are provided by qelib1.inc ), so this is possibly a misstep on my part, but might be practical.

I don't think this layout has space to possibly work, and I'm not quite sure of the physical constraints of these optical components, or how best to represent and align the optical paths. I changed the layout to simply pack the components neatly, keeping qubits in rows. It should be simple enough to pad the spacing to allow fibre routing, or whatever. The X spacing should probably be expanded out, so all the measures are at the same level.

This is the circuit I was trying for drawn using an online tool

I'd need some more guidance on the ideal placement criteria to do much more useful here, or on what is required for schematic generation.

[hornc]

repo has moved / project re-started, this is probably no longer relevant.