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Reference.org
Spin squeezing
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<p>Spin squeezing is a quantum process that decreases the variance of one of the angular momentum components in an ensemble of particles with a spin. The quantum states obtained are called spin <a href="/facts/Squeezed_state/hmfvCUHK">squeezed states</a>. Such states have been proposed for <a href="/facts/Quantum_metrology/d9bVkjj2">quantum metrology</a>, to allow a better precision for estimating a rotation angle than classical interferometers. </p>