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Institute for Theoretical Condensed Matter physics

Karlsruhe Institute of Technology

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D-76131 Karlsruhe

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Manipulation of a two-photon pump in superconductor - semiconductor heterostructures

Manipulation of a two-photon pump in superconductor - semiconductor heterostructures
Author:

Paul Baireuther, Peter P. Orth, Ilya Vekhter, Jörg Schmalian

Source:

Phys. Rev. Lett. 112, 077003 (2014)

preprint: arXiv:1308.4684

Date: 20.02.2014

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.