Josephson radiation and shot noise of a semiconductor nanowire junction

David J. Van Woerkom, Alex Proutski, Ruben J.J. Van Gulik, Tamás Kriváchy, Diana Car, Sébastian R. Plissard, Erik P.A.M. Bakkers, Leo P. Kouwenhoven, Attila Geresdi

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

We measured the Josephson radiation emitted by an InSb semiconductor nanowire junction utilizing photon-assisted quasiparticle tunneling in an ac-coupled superconducting tunnel junction. We quantify the action of the local microwave environment by evaluating the frequency dependence of the inelastic Cooper-pair tunneling of the nanowire junction and find the zero-frequency impedance Z(0)=492Ω with a cutoff frequency of f0=33.1GHz. We extract a circuit coupling efficiency of η≈0.1 and a detector quantum efficiency approaching unity in the high-frequency limit. In addition to the Josephson radiation, we identify a shot noise contribution with a Fano factor F≈1, consistently with the presence of single electron states in the nanowire channel.

Original languageEnglish
Article number094508
JournalPhysical Review B
Volume96
Issue number9
DOIs
Publication statusPublished - 11 Sep 2017

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