Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 54: Poster 3
Q 54.10: Poster
Donnerstag, 15. März 2012, 16:30–19:00, Poster.I+II
Cavity QED quantum interface — •Bernardo Casabone1, Andreas Stute1, Tracy Northup1, and Rainer Blatt1,2 — 1Institut für Experimentalphysik, Universität Innsbruck — 2Institut für Quantenoptik und Quanteninformation der Österreichischen Akademie der Wissenschaften, Innsbruck
While trapped ions are suitable candidates as qubits at quantum nodes, photons are ideal candidates as flying qubits to transfer quantum states between remote locations. Optical cavities provides a coherent and highly-efficient interface between ion and photon. Such an interface could be used as a quantum-memory-readout device, mapping the quantum state of a single ion to a single photon.
A system consisting of a single trapped 40Ca+ ion coupled to the mode of a high-finesse optical resonator is used. Intra-cavity photons are generated in a vacuum-stimulated Raman process between two atomic states driven by a laser and the cavity vacuum field. Single photons are generated on the 4P3/2 ↔ 3D5/2 transition, in which all Zeeman states are resolved in agreement with theoretical simulations. A laser on the narrow 4S1/2 ↔ 3D5/2 transition permits the addressing of individual Zeeman states. Coherent state manipulation on this transitions enables the initial preparation of any quantum state.
We present the results of mapping a initial quantum state of the trapped 40Ca+ ion to a polarization superposition of a single photon, via a bichromatic excitation of two vacuum-stimulated Raman transitions.