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TT: Fachverband Tiefe Temperaturen

TT 7: Superconductivity: Cryodetectors

TT 7.11: Talk

Monday, March 31, 2014, 12:30–12:45, HSZ 03

Manipulation of a two-photon pump in superconductor -- semiconductor heterostructures — •Peter P. Orth¹, Paul Baireuther², Ilya Vekhter³, and Jörg Schmalian¹ — ¹Institute for Theory of Condensed Matter, Karlsruhe Institute of Technology (KIT), , 76131 Karlsruhe, Germany — ²Instituut-Lorentz, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands — ³Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana, 70803, USA

We investigate the photon statistics, entanglement and squeezing of a pn-junction sandwiched between two superconducting leads, and show that such an electrically-driven photon pump generates correlated and entangled pairs of photons. In particular, we demonstrate that the squeezing of the fluctuations in the quadrature amplitudes of the emitted light can be manipulated by changing the relative phase of the order parameters of the superconductors. This reveals how macroscopic coherence of the superconducting state can be used to tailor the properties of a two-photon state.