\documentclass[12pt,a4paper]{article}
\usepackage{fullpage}

\begin{document}
   {\Huge Symbols for HOM paper }\\\\

   \begin{tabular}{| l | l |}
	\hline
	{\bf Symbol } & {\bf Description} \\ \hline\hline
	
	$D_{t}$ & Trigger photon detector. \\ \hline
	$D_a , D_b$ & Detector at the two arms A and B of the HOM. Arm-B has 2 detectors. \\ \hline
	$D_f$ & Detector to check the single atom loading.\\ \hline \hline

	$\tau_{s}$ & Coherence time of photon from single atom. \\ \hline
	$\tau_{f}$ & Coherence time of photon from FWM. \\  \hline
	$t_{T,A,B,L}$ & Arrival time of a photon on the respective detector.\\ \hline
	$T_{AB}$ & Coincidence time window between detection on $D_{a}$ and $D_{b}$.\\ \hline
	$T_t$ & Coincidence window for heralding on the trigger event.\\ \hline
	$\Delta t_d$ & delay between arrival of trigger signal and activation of AOM (variable).\\ \hline
	$\Delta t_p$ & delay between activation of AOM and pulse sent to EOM (fixed).\\ \hline
	$\Delta t_f$ & Delay through the long fiber.\\ \hline
	$\Delta t$ & Delay between the SA and FWM photon at the HOM beam-splitter.\\ \hline
	$\Delta t_m$ & Total measurement time\\ \hline \hline 

	$R^{DC}_{T,A,B,L}$ & Dark count rates of the respective detector.\\ \hline
	$R_L$ & Single atom loading rate\\  \hline
	$R_C$ & Single atom checking rate\\ \hline
	$R_t$ & Trigger photon rate\\ \hline
	$R_p$ & Single atom excitation rate (for the independent $g^{(2)}$ measurement)\\ \hline \hline

	$\delta_AC$ & AC Stark shift\\  \hline
	$\delta z$ & Zeeman shift\\ \hline
	$\delta_p$ & Optical pump beam detuning \\ \hline
	$\delta_r$ & repump beam detuning \\ \hline
	$\Omega$ & Excitation rabi frequency\\ \hline
	$\lambda_D$ & Dipole trap wavelength\\ \hline
	$\lambda_{s}$ & photon wavelength from single atom\\ \hline
	$\lambda_{f}$ & photon wavelength from FWM\\ \hline
	$\lambda_{t}$ & Trigger photon wavelength\\ \hline
	$\lambda_{p1}, \lambda_{p2}$ & FWM pump wavelengths\\ \hline
	$\delta_{p1}, \delta_{p2}$ & FWM pump detunings\\ \hline \hline

	$\eta_{f}$ & Trigger herlading efficiency of FWM photon. \\ \hline
	$\eta_{s}$ & Efficiency of single-atom photon.\\ \hline \hline
   \end{tabular}
\end{document}
