Frankfurt 2006 – scientific programme

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Q: Quantenoptik und Photonik

Q 75: Poster Quanteninformation

Q 75.13: Poster

Thursday, March 16, 2006, 16:30–18:30, Labsaal

Quantum Memory and Two-Mode-Squeezing in Atomic Ensembles — •Christine Muschik, Klemens Hammerer, and J. Ignacio Cirac — Max Planck Institut für Quantenoptik, Hans Kopfermannstr.1, 85748 Garching

We propose two protocols based on a scheme for an atomic ensemble in a magnetic field interacting wih light. The first protocol provides a passive interaction that enables the exchange of states of light and atoms. It can therefore be used as a quantum memory. An unknown state of light can be written onto the collective spin state of the atoms and subsequently be retrieved. Remarkably the fidelity of the state transfer approaches unity exponentially in the coupling strength. The second protocol creates an EPR state between atoms and light. The interspecies correlations produced in the scheme can be used to perform quantum teleportation and unconditional spin squeezing of the collective spin of the atomic sample. Squeezing which grows exponentally in the coupling can be achieved. Both protocols are shown to be robust against the dominant sources of noise.