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An entanglement-enhanced atomic gravimeter
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abstract
Interferometers based on ultra-cold atoms enable an absolute measurement of inertial forces with unprecedented precision. However, their resolution is fundamentally restricted by quantum fluctuations. Improved resolutions with entangled or squeezed atoms were demonstrated in internal-state measurements for thermal and quantum-degenerate atoms and, recently, for momentum-state interferometers with laser-cooled atoms. Here, we present a gravimeter based on Bose-Einstein condensates with a sensitivity of $-1.7^{+0.4}_{-0.5}\,$dB beyond the standard quantum limit. Interferometry with Bose-Einstein condensates combined with delta-kick collimation minimizes atom loss in and improves scalability of the interferometer to very-long baseline atom interferometers.
Forward citations
Cited by 2 Pith papers
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Squeezing-enhanced accurate differential sensing under large phase noise
Using two spin-squeezed atom interferometers and ellipse fitting, differential phase sensitivity can scale as N^{-2/3} per measurement, a gain of N^{1/6} over the standard quantum limit, even under full 2π common-mode noise.
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Terrestrial Very-Long-Baseline Atom Interferometry: Summary of the Second Workshop
A workshop summary that compiles physics targets, technology advances, and a proto-collaboration roadmap for kilometer-scale atom interferometers aimed at dark matter and gravitational wave detection.
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