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Published Online May 22, 2003
Science DOI: 10.1126/science.1085946

Reports

Submitted on April 21, 2003
Accepted on May 13, 2003

Atomic Memory for Correlated Photon States

C. H. van der Wal 1, M. D. Eisaman 1, A. André 1, R. L. Walsworth 2, D. F. Phillips 2, A. S. Zibrov 3, M. D. Lukin 1*

1 Department of Physics, Harvard University, Cambridge, MA 02138, USA.
2 Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA.
3 Department of Physics, Harvard University, Cambridge, MA 02138, USA; Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; P. N. Lebedev Institute of Physics, Moscow 117924, Russia.

* To whom correspondence should be addressed. E-mail: lukin{at}physics.harvard.edu.

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.


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