There has recently been much interest in coupling light with atomic ensembles to develop a quantum interface. Several proposals have been published to utilise this kind of interface for spin squeezing, quantum memories, quantum teleportation, and entanglement . Many of these proposals have been realised experimentally. Spin squeezing is the simplest of these applications, and has been demonstrated several times. However, all of these realisations have been performed using squeezed states of light or samples in vapour cells with relatively low signal to noise ratio.
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