Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 34: Quantum Effects: QED I

Q 34.4: Talk

Wednesday, March 25, 2015, 12:00–12:15, B/SR

High fidelity quantum state transfer between photonic qubits and matter qubits in free space using electromagnetically induced transparency — •Nils Trautmann and Gernot Alber — Institut für Angewandte Physik, Technische Universität Darmstadt,D-64289, Germany

We propose a procedure to achieve high fidelity conversion between a photonic qubit encoded in a single photon wave packet and a matter qubit encoded in the atomic level structure of a single atom in free space with a high success probability. This procedure makes use of electromagnetically induced transparency in order to control the interaction between the atom and the radiation field. Thereby, a matter qubit can be converted into a photonic qubit stored in a time-symmetric single photon wave packet which can be absorbed almost perfectly by a second atom due to time reversal symmetry. By absorbing such a single photon wave packet, the photonic qubit can be converted back into a matter qubit thereby achieving a high fidelity quantum state transfer between distant matter qubits. In contrast to already known schemes, the protocol proposed in this article does not rely on high finesse cavities and optical fibers and is compatible with a free space communication channel.