QuantumSketch ver. 1.1.0 by So Katagiri
mode

Mode Change [m]

Add Point [v]

Add Loop [l]

Draw Propagator [p]

Draw Propagator2 [-]

(Red) Select [click]

Sub (green) select [double click]

Select reverse [c]

Next select [n]

Back select [b]

Next sub select [s]

Back sub select [a]

Allow direction change [t]

Line style change [q]

Remove arrow [@]

fill loop [f]

Scale up [w]

Scale down [x]

Arc angle change [W,X,E,C]

rotation [r, R]

Up select target [8]

Right select target [6]

Left select target [4]

Down select target [2]

No select mode In/Out [z]

String Input [/]

copy [ctr + c]

Export tikz text [e]

Export svg text [ctr + e]

Undo [<]

Redo [>]

\documentclass[10pt]{article}

\usepackage{amsmath}

\usepackage{tikz}

\usetikzlibrary{intersections, calc, arrows, snakes, decorations}

\begin{document}

\end{document}

OutPut