Interferometry, the most precise measurement technique known today,
exploits the wave-like nature of the atoms or photons in the
interferometer. As expected from the laws of quantum mechanics, the
granular, particle-like features of the individually independent
atoms or photons are responsible for the precision limit, the shot
noise limit. However this "classical" bound is not fundamental and
it is the aim of quantum metrology to overcome it by employing
entanglement among the particles. This work reports on the
realization of spin-squeezed states suitable for atom
interferometry. Spin squeezing was generated on the basis of
motional and spin degrees of freedom, whereby the latter allowed
the implementation of a full interferometer with quantum-enhanced
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