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Springer eBooks

Experiments with Correlated Atom-Photon States

Tilman Pfau, Christian Kurtsiefer, Christopher R. Ekstrom, J. Mlynek

Published Jan 1, 1996• 0 citations
Publisher
DOI
10.1007/978-1-4757-9742-8_17

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We report on an improved version of Young's double-slit experiment for thermal atoms, that allows two-particle correlation experiments to be performed with atom - photon pairs. We propose the use of single-photon scattering for the controlled preparation of highly entangled states of more than two particles. The principle is discussed for an entangled atom - photon pair, which offers the possibility of realizing a virtual double-slit experiment for atoms. Then the scheme is extended in an obvious way to prepare a so-called GHZ state made up of two photons and one atom. In general, highly entangled states can be built up involving the centre-of-mass wavefunction of an atom and the occupation of radiation modes by sequentially scattered photons.
We experimentally demonstrate emission of two quantum-mechanically correlated light pulses with a time delay that is coherently controlled via temporal storage of photonic states in an ensemble of rubidium atoms. The experiment is based on Raman scattering, which produces correlated pairs of spin-flipped atoms and photons, followed by coherent conversion of the atomic states into a different photon beam after a controllable delay. This resonant nonlinear optical process is a promising technique for potential applications in quantum communication.