Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 23: Poster 2: Intersectional Session

Q 23.31: Poster

Dienstag, 15. März 2011, 18:00–21:00, P1

Towards a universal, single-atom based quantum interconnect — •Andreas Reiserer, Holger Specht, Christian Nölleke, Manuel Uphoff, Eden Figueroa, Stephan Ritter, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching

A prerequisite for the realization of quantum networks is a coherent interface between flying and stationary qubits. A promising candidate for such a device is a single atom that interacts with single photons via a high-finesse optical cavity. It has been shown that atom-cavity systems can be used for efficient and controlled single photon production via vacuum stimulated Raman transitions (vSTIRAP) between two atomic ground states. Here, we report on the reverse process - coherent absorption of single photons by a single atom. In our setup, we quasi-permanently trap a single Rb atom in a resonator in the intermediate coupling regime of cavity QED. We prepare the atom in the lower atomic hyperfine state (F=1). By adiabatically ramping down the power of a strong control laser pulse, we cause the atom to absorb a single photon out of a weak coherent probe pulse impinging on the cavity. In this process, the atom is transferred to the upper atomic ground state (F=2). After a finite storage time, a vSTIRAP is used to read out the stored excitation by producing a single photon. The current status towards the implementation of a quantum memory will be presented.