Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 51: Superconductivity: Tunneling, Josephson Junctions, SQUIDs
TT 51.12: Vortrag
Mittwoch, 9. März 2016, 18:15–18:30, H19
Antibunched photons from inelastic Cooper-pair tunneling — •Juha Leppäkangas1,2, Mikael Fogelström1, Alexander Grimm3, Max Hofheinz3, Michael Marthaler2, and Göran Johansson1 — 1Microtechnology and Nanoscience, MC2, Chalmers University of Technology, Göteborg, Sweden — 2Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, Karlsruhe, Germany — 3Université Grenoble Alpes, INAC-SPSMS, Grenoble, France
We demonstrate theoretically that charge transport across a Josephson junction, voltage-biased through a resistive environment, produces antibunched photons. We develop a continuous-mode description of the emitted radiation field in a semi-infinite transmission line terminated by the Josephson junction. Within a perturbative treatment in powers of the tunneling coupling across the Josephson junction, we capture effects originating in charging dynamics of consecutively tunneling Cooper pairs. We find that within a feasible experimental setup the Coulomb blockade provided by high zero-frequency impedance can be used to create antibunched photons at a very high rate and in a very versatile frequency window ranging from a few GHz to a THz.