\documentclass{beamer}
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\usepackage{import} 
%\usepackage[absolute,overlay]{textpos}
%\usepackage{multimedia} 
\usepackage{booktabs}
% \usepackage{bbold}
\usepackage{xcolor}
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% \usepackage{dsfont} 
\usepackage[english]{babel}
\usepackage[latin1]{inputenc}
\usepackage{times} 
\usepackage{tabularx} 
\usepackage{multirow}
\usepackage{tikz}
\usepackage[T1]{fontenc}
\usepackage{xfrac} 
\usepackage{graphicx}
\usepackage{mathtools}
\usepackage{overpic}
% \usepackage{physics}
\DeclareGraphicsRule{.ai}{pdf}{.ai}{}

\mode<presentation>
{
	\usetheme{Singapore}
%	\usetheme{Warsaw}
	\usecolortheme{dove} %% Grigio
	\setbeamercovered{transparent}
}


%\setbeamertemplate{footline}[frame number] 
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  \insertshorttitle\hfill%
  \insertframenumber\,/\,\inserttotalframenumber}

\setbeamertemplate{navigation symbols}{} %no nav symbols
\setbeamertemplate{itemize item}{}
\setbeamertemplate{headline}{}

\title[Secure Quantum Clock Synchronization]{Secure Quantum Clock Synchronization}
% \subtitle{}

\author[Jianwei Lee] % (optional, use only with lots of authors)
{Jianwei Lee, Lijiong Shen, Alessandro Cer{\`e}, James Troupe, Christian Kurtsiefer, Antia Lamas-Linares}

% \pgfdeclareimage[height=1.3cm]{university-logo-full}{Images/logo}
\institute[CQT] % (optional, but mostly needed)
{
%   \inst{1}%
\begin{columns}
  \column{.4\textwidth}
  \begin{center}    
    \includegraphics[width=0.8\textwidth]{images/NUS_Logo.ai}
    \end{center}   
  \column{.5\textwidth}
  \begin{center}
  	 \includegraphics[width=\textwidth]{images/CQTLogo.ai}\\
		 Quantum Optics Group	
  \end{center}
\end{columns}
}
 
\date{} 
% \date{
%   \begin{center} 
%   IPS 2015\\
%   4 Mar \\
%   01.50pm $-$ 02.05pm
%   \end{center}
% }
% \date[]{04/03/2015} % (optional, should be abbreviation of conference name)
%{Centre for Quantum Technology - UKZN}
\subject{Secure Quantum Clock Synchronization}

\begin{document}

\begin{frame}[plain]
  \setcounter{framenumber}{0}
  \titlepage
\end{frame}
\include{clock_intro}
\include{clock_quantum}
\include{clock_asymm}
\include{clock_conclusion} 
\end{document}
%EOF