Physics
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..977..291m&link_type=abstract
RECENT DEVELOPMENTS IN GRAVITATION AND COSMOLOGY: 3rd Mexican Meeting on Mathematicaland Experimental Physics. AIP Conference P
Physics
1
Atom And Neutron Interferometry, Atom Interferometry Techniques, Reflectors, Beam Splitters, And Deflectors, Quantum Electrodynamics
Scientific paper
We report on our experiment to measure h/M, the ratio of the Planck constant to the mass of Cs atoms, and thereby the fine-structure constant. The target accuracy is 1 part per billion or better. We focus on two recent milestones: (i) The first realization of atom interferometers based on light-pulse beam splitters that transfer the momentum of up to 12 photon pairs, which increases the useful signal (matter wave phase shift) by a factor of 144 compared to the beam splitters used in the best present atom interferometers. Moreover, they lead to a cancellation of important systematic effects. (ii) The first realization of a simultaneous pair of conjugate Ramsey-Bordé interferometers. In these, the relative sign of the inertial term is reversed so that it can be cancelled. Simultaneous operation means that this holds for a time-dependent inertial term (vibrations) too, which promises a substantial improvement in the signal to noise ratio.
Chiow Sheng-wey
Chu Steven
Herrmann Sven
Müller Holger
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