We report the demonstration of a Sagnac-effect atom interferometer gyroscope which uses stimulated Raman transitions to coherently manipulate atomic wave packets. We have measured the Earth's rotation rate, and demonstrated a short-term sensitivity to rotations of $2\times {10}^{-8\mathrm{}}\left(\mathrm{rad}/\mathrm{s}\right)/\sqrt{\mathrm{Hz}}$.

• Received 10 September 1996

DOI:https://doi.org/10.1103/PhysRevLett.78.2046