Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 26: Transport - Poster Session
TT 26.20: Poster
Mittwoch, 29. März 2006, 14:30–18:30, P1
Experimental Realization and Testing of Microwave Beam Splitters — •Andreas Emmert1, Matteo Mariantoni1, Henning Christ2, Enrique Solano2,3, Markus J. Storcz4, Frank K. Wilhelm4, Achim Marx1, and Rudolf Gross1 — 1Walther-Meissner-Institut, Walther-Meissner-Str. 8, D-85748 Garching, Germany — 2Department Physik, ASC and CeNS, Ludwig-Maximilians-Universität, Theresienstr. 37, D-80333 München, Germany — 3Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany — 4Sección Física, Departamento de Ciencias, Pontificia Universidad Católica del Perú, Apartado 1761, Lima, Peru.
Balanced quantum homodyne detection and tomography are powerful techniques which allow for the entire Wigner function reconstruction of weak quantum signal in the optical and microwave domains. In both domains, the central device of these schemes is a balanced and lossless beam splitter. As recently proposed [1] (see also presentation TT 19, E. Solano), at microwave frequencies a beam splitter can be implemented on a chip by means of a so-called hybrid ring.
We report on the realization and measurement of the characteristic S-parameters of microwave beam splitters made of Niobium thin films, in a coplanar wave guide design. In particular, the coupling and isolation properties of this device have been experimentally tested. The simple design architecture is suitable for a large scale production. This work was supported by the SFB 631 of the DFG.
[1] M. Mariantoni et al., cond-mat/0509737.