Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 33: Quantum information systems I (with HL/TT)
MA 33.1: Vortrag
Mittwoch, 2. April 2014, 15:00–15:15, POT 006
Improving the efficiency of passive Hall effect circulator — •Giovanni Viola1 and David DiVincenzo1,2 — 1Institute for Quantum Information , RWTH Aachen — 2Department of Theoretical Nanoelectronics, Peter Gruenberg Institute, Forschungszentrum Juelich
Low temperature microwave technology and the implementation of quantum computation require circulators as building blocks. Three-port circulators are examples of non-reciprocal devices; they should be passive, low noise and must operate at and below microwave frequencies. It is known that the Hall effect in the quantum regime shows non reciprocal behavior, and it can be utilized in a straightforward way in the realization of highly lossy circulators as well as gyrators. We have analyzed the physical origin of this lossy behaviour and, based on this understanding, developed a novel device that improves efficiency by dealing with the galvanic loss of the earlier designs. These novel circulators and gyrators are particularly suitable for current experiments: they are characterized by low loss and should be suitable for low temperature operation.