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NOON states are a class of path-entangled or polarization-entangled states consisting of N photons that achieves better performance in phase estimation compared to coherent states as input. These NOON states have proven to achieve super-resolution and to break the shot-noise limit. Ideally they achieve the Heisenberg limit for any value of the phase. This is an advantage over squeezed states, which...
We demonstrate a light-shot-noise-limited magnetometer based on the Faraday effect in a hot unpolarized ensemble of rubidium atoms. By using off-resonant, polarization-squeezed probe light, we improve the sensitivity of the magnetometer by 3.2 dB.
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