Q2Graph is a simple canvas for modelling and manipulating of generalised quantum
graph states.
Q2Graph is a Qt5 Graphics View architecture.
The Q2Graph user may add, move or change a node ('vertex') or add/remove an
interaction ('edge') between the node and another node, using a small set of
keystrokes and mouse clicks.
Opening the Q2Graph application will reveal a white canvas space within grey
borders; a limited dropdown menu bar is also visible. All graph operations are
restricted to the canvas space.
graph operations:
The following keystrokes will determine the outcome of the subsequent mouse
click(s).
The keystroke letter appears as a label that will track your cursor.
Note, if the letter is still visible, you have not completed the requested
operation.
e - Edge, is a two mouse-clicks operation.
first, left-click on your choice of first vertex then, left-click on your
choice of second vertex.
A limited context menu is available by right-clicking on an edge.
o - Local Complementation (LC), left-click on your choice of target vertex to
LC the neighbouring vertices of the target vertex.
v - Vertex, left-click to place a new vertex at any position within the
canvas.
You may drag-and-drop a vertex, which will also resize any associated
edges.
A limited context menu is available by right-clicking on a vertex.
local Pauli measurements (LPM):
Specifications of Pauli measurement operations as rendered by Q2Graph derive
from:
Hein, M., Dür, W., Eisert, J., Raußendorf, R., Van den Nest, M. and
Briegel, H.J. 2006 Entanglement in Graph States and its Applications. In,
Casati, G., Shepelyansky, D.L., Zoller, P. and Benenti, G. 'Quantum
Computers, Algorithms and Chaos, Proceedings of the International School of
Physics "Enrico Fermi"; course 162', pp. 115-218. IOS Press, Amsterdam.
x - is a two mouse-clicks operation.
The first left-click on a vertex sets it as target vertex 1.
Those vertices eligible to be set as the 'special neighbour' of vertex 2
will change colour to green.
The second left-click on one of the green vertices sets it as target
vertex 2; in order, the following actions will execute:
- LC the neighbouring vertices of vertex 2, then
- a Y-LPM on vertex 1, and
- a second LC on the neighbouring vertices of vertex 2.
y - left-click on a vertex to set it as the target and LC the neighbouring
vertices; a Z-LPM on the target vertex completes the operation.
z - left-click on a vertex to delete it and its edges.
Save and load graphs:
A graph may be saved to or loaded from file.
A file must be saved in .json format.
Q2Graph does not read .txt files (yet!).