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We report an experimental study of a new technique for spin cooling an ensemble of ultracold atoms via quantum non-demolition (QND) measurement and incoherent feedback. This is a form of entropie cooling of the spins that increases the phase space density, in contrast to coherent feedback schemes such as described in Refs.[l, 2]. Our technique has potential applications in quantum optics such as quantum...
We report an experimental study of a new technique for entropic cooling of the spin in an ensemble of ultracold atoms via quantum non-demolition (QND) measurement and incoherent feedback.
Atomic ensembles have gained a lot of interest in the last decade for their prospective use as quantum memories, in precision measurements and other applications in quantum information processing. The atomic part of the interface presented here is an all-optically trapped atomic ensemble of 87Rb at a temperature of 25 muK. The ensemble consists of 106 atoms and has an elongated shape with an aspect...
Highly sensitive Faraday rotation measurements are performed on an ensemble of 87Rb. The deduced interaction strength is discussed in the context of spin squeezing. We present a method for spin state tomography based on Faraday rotation measurements.
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