A compact dual atom interferometer gyroscope based on laser-cooled   rubidium
  We present a compact and transportable inertial sensor for precision sensing of rotations and accelerations. The sensor consists of a dual Mach-Zehnder-type atom interferometer operated with laser-cooled $^{87}$Rb. Raman processes are employed to coherently manipulate the matter waves. We describe and characterize the experimental apparatus. A method for passing from a compact geometry to an extended interferometer with three independent atom-light interaction zones is proposed and investigated. The extended geometry will enhance the sensitivity by more than two orders of magnitude which is necessary to achieve sensitivities better than $10^{-8} $rad/s/$\sqrt{\rm Hz}$. 
T. M\"uller, M. Gilowski, M. Zaiser, T. Wendrich, W. Ertmer, and E. M.   Rasel