By Paul R. Berman

The sector of atom interferometry has accelerated speedily lately, and todays learn laboratories are utilizing atom interferometers either as inertial sensors and for precision measurements. Many researchers additionally use atom interferometry as a way of gaining knowledge of basic questions in quantum mechanics. **Atom Interferometry comprises contributions from theoretical and experimental physicists on the vanguard of this swiftly constructing box. Editor Paul R. Berman contains an exceptional stability of historical past fabric and up to date experimental results,providing a basic evaluation of atom interferometry and demonstrating the promise that it holds for the longer term. Key positive aspects * comprises contributions from some of the examine teams that experience pioneered this rising box * Discusses and demonstrates new facets of the wave nature of atoms * Explains the various very important functions of atom interferometry, from a dimension of the gravitational consistent to atom lithography * Examines functions of atom interferometry to essentially very important quantum mechanics difficulties
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**Additional resources for Atom Interferometry**

**Sample text**

We observed these predicted Rabi oscillations, corresponding to the coherent exchange of photons, in our atomic beam. Rabi oscillations correspond to the alternate absorption and (stimulated) emission of one photon from the laser beam. Since the transferred m o m e n t u m is respectively l h k and - l h k , there is a corresponding oscillation in the transverse m o m e n t u m of the atoms. Excited atoms were identified by the deflection imparted to them by the absorbed photon. An atom exiting the laser field in the excited state will have received l h k of m o m e n tum in the direction of propagation of the laser and the subsequent spontaneous OPTICS AND INTERFEROMETRY 17 photon will transfer another l h k of momentum in a random direction.

It is convenient to rewrite Eq. (11) as qgposition(t) = qggrating(t- T) q- kg(Xl(t- 2"/') - X l ( t - T)) -k- kg(X3(t ) - x 3 ( t - T)) (12) where the first term, which is called the grating phase and is given by qggrating(t) -- kg(Xl(t ) - 2Xz(t ) + Xa(t)), is the position phase [Eq. (5)] at the instant when the particle passed through the middle grating, while the other two terms describe the effects of grating motion during the free flight of the particle through the interferometer. If the changes in position of the gratings are due to acceleration and rotation of the interferometer as a whole, we can derive expressions for phase shifts due to these non-inertial motions.

9. A schematic, not to scale, of our atom interferometer (thick lines are atom beams). The 0th and 1st order beams from the first grating strike the middle grating where they are diffracted in the 1st and - 1 st orders. These orders form an interference pattern in the plane of the third grating, which acts as a mask to sample this pattern. The detector, located beyond the third grating, records the flux transmitted through the third grating. The 10 cm long interaction region with the 10 /zm thick copper foil between the two arms of the interferometer is positioned behind the second grating.