diff --git a/chapter-qkd/chapter.pdf b/chapter-qkd/chapter.pdf
index 42468e7..f350721 100644
Binary files a/chapter-qkd/chapter.pdf and b/chapter-qkd/chapter.pdf differ
diff --git a/chapter-qkd/chapter.tex b/chapter-qkd/chapter.tex
index f4f111a..eef5642 100644
--- a/chapter-qkd/chapter.tex
+++ b/chapter-qkd/chapter.tex
@@ -2,9 +2,46 @@
 \usepackage[ngerman, english]{babel}
 \usepackage[utf8]{inputenc}
 \usepackage[a4paper, top=3cm, bottom=3.5cm, inner=3.5cm, outer=5cm, marginpar=4cm]{geometry}
-% Matti remarkable tablet special size
-%\usepackage[paperwidth=15cm, paperheight=244mm, top=1cm, bottom=1cm, left=5mm, right=5mm]{geometry}
 \usepackage[T1]{fontenc}
+\usepackage{amssymb}
+\usepackage{amsmath}
+\usepackage{listings}
+\usepackage{eurosym}
+\usepackage{wasysym}
+\usepackage{extdash}
+\usepackage{amsthm}
+\usepackage{tabularx}
+\usepackage{multirow}
+\usepackage{multicol}
+\usepackage{tikz}
+\usepackage{mathtools}
+\usepackage{setspace}
+\usepackage{titlesec}
+\usepackage{fancybox}
+\usepackage{fancyhdr}
+\usepackage[binary-units,per-mode=fraction]{siunitx}
+\usepackage[hidelinks]{hyperref}
+\usepackage{commath}
+\usepackage{graphicx,color}
+\usepackage{ccicons}
+\usepackage{subcaption}
+\usepackage{float}
+\usepackage{footmisc}
+\usepackage{array}
+\usepackage[underline=false]{pgf-umlsd}
+\usetikzlibrary{calc}
+\usepackage{epstopdf}
+\usepackage{pdfpages}
+\usepackage{minitoc}
+\usepackage{minted} % pygmentized source code
+%\usepackage[pdftex]{graphicx,color}
+%\usepackage{showframe} Useful for page layout debugging
+
+\DeclareSIUnit{\baud}{Bd}
+
+\DeclarePairedDelimiter{\ceil}{\lceil}{\rceil}
+\DeclarePairedDelimiter{\paren}{(}{)}
+
 \usepackage[
     backend=biber,
     style=numeric,
@@ -29,53 +66,6 @@
         }
     }
 }
-\usepackage{amssymb,amsmath}
-\usepackage{listings}
-\usepackage{eurosym}
-\usepackage{wasysym}
-\usepackage{extdash}
-\usepackage{amsthm}
-\usepackage{tabularx}
-%\usepackage{showframe} Useful for page layout debugging
-\usepackage{multirow}
-\usepackage{multicol}
-\usepackage{tikz}
-\usepackage{mathtools}
-\usepackage{setspace}
-\usepackage{titlesec}
-\usepackage{fancybox}
-\usepackage{fancyhdr}
-\DeclarePairedDelimiter{\ceil}{\lceil}{\rceil}
-\DeclarePairedDelimiter{\paren}{(}{)}
-
-\usetikzlibrary{arrows}
-\usetikzlibrary{chains}
-\usetikzlibrary{backgrounds}
-\usetikzlibrary{calc}
-\usetikzlibrary{decorations.markings}
-\usetikzlibrary{decorations.pathreplacing}
-\usetikzlibrary{fit}
-\usetikzlibrary{patterns}  
-\usetikzlibrary{positioning}
-\usetikzlibrary{shapes}
-
-\usepackage[binary-units,per-mode=fraction]{siunitx}
-\DeclareSIUnit{\baud}{Bd}
-\usepackage[hidelinks]{hyperref}
-\usepackage{commath}
-\usepackage{graphicx,color}
-\usepackage{ccicons}
-\usepackage{subcaption}
-\usepackage{float}
-\usepackage{footmisc}
-\usepackage{array}
-\usepackage[underline=false]{pgf-umlsd}
-\usetikzlibrary{calc}
-%\usepackage[pdftex]{graphicx,color}
-\usepackage{epstopdf}
-\usepackage{pdfpages}
-\usepackage{minitoc}
-\usepackage{minted} % pygmentized source code
 
 % Re-define heading formats to force single line spacing
 \titleformat{\section}{\normalfont\large\bfseries\singlespacing}{\thesection}{1em}{}
@@ -114,6 +104,7 @@
         \setlength{\fboxsep}{2mm}
         \shadowbox{
             \parbox{3cm}{
+                \setstretch{1.0}
                 \raggedright
                 \textsf{
                     \small\textbf{To do}\\