Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 17: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs

TT 17.9: Talk

Monday, March 31, 2014, 17:15–17:30, HSZ 201

Coherent radiation from the fractional Josephson effect — •Christoph Ohm and Fabian Hassler — Institut für Quanteninformation, RWTH Aachen

At a Josephson junction between two topological superconductors single electrons are transported coherently between the two superconducting reservoirs. This effect is known as the fractional Josephson effect. It has been shown that a voltage-biased fractional Josephson junction produces radiation at a frequency that is half of the ordinary Josephson frequency. We study the coherence properties of this unconventional Josephson radiation including phase- and frequency-fluctuations. We show that the coherence time of the emitted radiation is dominated by quasi-particle poisoning. In addition, we discuss the fermionic parity constraint as well as pinning of the Josephson frequency in terms of second order correlation functions between radiation fields from different emitters.