document: Recording quantum properties of light in a long-lived atomic spin state : towards quantum memory We report an experiment on mapping a quantum state of light onto the ground state spin of an ensemble of Cs atoms with the lifetime of 2 ms. Recording of one of the two quadrature phase operators of light is demonstrated with vacuum and squeezed states of light . The sensitivity of the mapping procedure at the level of approximately 1 photon/sec per Hz is shown . The results pave the road towards complete -LRB- storing both quadrature phase observables -RRB- quantum memory for Gaussian states of light . The experiment also sheds new light on fundamental limits of sensitivity of the magneto-optical resonance method
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