Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 66: Quantum Effects: QED III
Q 66.3: Talk
Friday, March 4, 2016, 11:45–12:00, f442
Towards strong ion-photon coupling in an ion-trap fiber-cavity apparatus — Klemens Schueppert1, Florian Ong1, Bernardo Casabone1, Konstantin Friebe1, Dario A. Fioretto1, Moonjoo Lee1,2, Konstantin Ott3, Jakob Reichel3, Tracy Northup1, and •Rainer Blatt1,2 — 1Institute for Experimental Physics, University Innsbruck, Austria — 2Institute for Quantum Optics and Quantum Information, Austria — 3Laboratoire Kastler Brossel, ENS/CNRS/UPMC/CdF Paris, France
Quantum networks offer a compelling solution to the challenge of scalability in quantum computing. With atoms coupled to optical cavities it is possible to build up quantum interfaces between stationary and flying qubits in a quantum network. By using fiber-based optical cavities, we expect to reach the strong coupling regime of cavity quantum electrodynamics with single trapped ions. This regime allows higher fidelity and efficiency in protocols for quantum interfaces.
The challenge in integrating fiber cavities with ion traps is that the dielectric fibers should be far enough from the ions so that they do not significantly alter the trap potential. However, with our previous fiber-mirror machining process, cavity lengths were limited to about 250 µm due to deviations from the mirrors’ ideal spherical shape. Therefore, we have developed new CO2-laser ablation techniques for the fiber facets. With the resulting fibers, we have constructed fiber cavities with finesses up to 70,000 at a length of 550 µm. To integrate these fiber cavities with ions, we have built a new miniaturized calcium ion trap in the “Innsbruck” linear design.