Mapping a quantum state of light onto a long-lived atomic spin state: towards quantum memory

Details Mapping a quantum state of light onto a long-lived atomic spin state: towards quantum memory Mapping a quantum state of light onto a long-lived atomic spin state: towards quantum memory

2002-03-05

arxiv.org/abs/quant-ph/0203023v1

Phys. Rev. Lett., vol. 89, 057903 (2002)

Physics

Quantum Physics

5 pages, 4 figures, RevTeX

Scientific paper

10.1103/PhysRevLett.89.057903

We report an experiment on mapping a quantum state of light onto the ground state spin of an ensemble of Cs atoms with the life time of 2 milliseconds. Quantum memory for 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 one photon/sec per Hz is shown. The results pave the road towards complete (storing both quadrature phase observables) 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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