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Probing of delicate systems demands high sensitivity from limited probe energy. Quantum optical techniques to beat the standard quantum limit (SQL) offer a practical advantage for these measurements. Here we report the first entanglement-enhanced measurement of a delicate material system [1]. We non-destructively probe an atomic spin ensemble by near-resonant Faraday rotation, a measurement that is...
Probing of delicate systems demands high sensitivity from limited probe energy. Quantum optical techniques to beat the standard quantum limit (SQL) offer a practical advantage for these measurements. Here we report the first entanglement-enhanced measurement of a delicate material system [1]. We non-destructively probe an atomic spin ensemble by near-resonant Faraday rotation, a measurement that is...
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 show that a anti-correlation of a Stokes parameter implies polarization entanglement according to the PPT criterion and analyze an experiment underway to make a bright source of entangled photons using polarization squeezed light. The polarization of light can be analyzed by using either the continuous variable (CV) or the discrete variable (DV) formalism. We demonstrate that it is possible to...
The ability to measure magnetic fields with high sensitivity is a key requirement in many physical, biological and medical applications. Currently the most sensitive magnetometers are optical magnetometers, in which the polarization of an atomic sample responds to the field and is read out by an optical measurement. These instruments are limited by two fundamental sources of quantum noise: projection...
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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