# Atom Interferometer Measurement of the Newtonian Constant of Gravity

@article{Fixler2007AtomIM, title={Atom Interferometer Measurement of the Newtonian Constant of Gravity}, author={J. B. Fixler and G. T. Foster and Justin McGuirk and Mark A. Kasevich}, journal={Science}, year={2007}, volume={315}, pages={74 - 77} }

We measured the Newtonian constant of gravity, G, using a gravity gradiometer based on atom interferometry. The gradiometer measures the differential acceleration of two samples of laser-cooled Cs atoms. The change in gravitational field along one dimension is measured when a well-characterized Pb mass is displaced. Here, we report a value of G = 6.693 × 10–11 cubic meters per kilogram second squared, with a standard error of the mean of ±0.027 × 10–11 and a systematic error of ±0.021 × 10–11…

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## References

SHOWING 1-10 OF 17 REFERENCES

### High-precision gravity measurements using atom interferometry

- Physics
- 1998

We have built an atom interferometer that can measure g, the local acceleration due to gravity, with a resolution of Δg/g = 2 × 10−8 after a single 1.3 s measurement cycle, 3 × 10−9 after 1 min and 1…

### Absolute measurement of the Newtonian force and a determination of G

- Physics
- 1999

We present the status and preliminary results of the Wuppertal gravitational experiment which is based on a microwave resonator. The gravitational force of two test masses acting on the resonator is…

### A free-fall determination of the newtonian constant of gravity

- Physics, EducationScience
- 1998

An experiment that uses the gravity field of a one-half metric ton source mass to perturb the trajectory of a free-falling mass and laser interferometry to track the falling object was performed.

### Measurement of the Earth's Gravity Gradient with an Atom Interferometer-Based Gravity Gradiometer

- Physics, Education
- 1998

We report the demonstration of an atom interferometer-based gravity gradiometer. The gradiometer uses stimulated two-photon Raman transitions to measure the relative accelerations of two ensembles of…

### A value for G from beam-balance experiments

- Physics
- 1999

A high-precision measurement of the Newtonian gravitational constant G by means of a beam balance is being carried out at the University of Zurich. We have made test measurements in which the…

### A new precise determination of Newton's gravitational constant

- Physics
- 1995

A new determination of the numerical value of the gravitational constant G was carried out by means of an apparatus consisting of a fibreless torsion balance which was carried by the buoyancy of a…

### Atom interferometry

- Physics
- 2002

In this paper, we present a brief overview of atom interferometry. This field of research has developed very rapidly since 1991. Atom and light wave interferometers present some similarities but…

### Measurement of Newton's constant using a torsion balance with angular acceleration feedback.

- PhysicsPhysical review letters
- 2000

Newton's gravitational constant G is measured using a new torsion balance method that is insensitive to anelastic torsions fiber properties, and a flat plate pendulum minimizes the sensitivity due to the pendulum density distribution.

### The Newtonian gravitational constant: recent measurements and related studies

- Physics
- 1997

Improvements in our knowledge of the absolute value of the Newtonian gravitational constant, G, have come very slowly over the years. Most other constants of nature are known (and some even…

### Trapping of neutral sodium atoms with radiation pressure.

- PhysicsPhysical review letters
- 1987

The confinement and cooling of an optically dense cloud of neutral sodium atoms by radiation pressure was reported, provided by three retroreflected laser beams propagating along orthogonal axes, with a weak magnetic field used to distinguish between the beams.