Home | deutsch  | Legals | Data Protection | Sitemap | KIT

Institute for Theoretical Condensed Matter physics

Karlsruhe Institute of Technology

Wolfgang-Gaede-Str. 1
D-76131 Karlsruhe

Phone: +49 721 608-43367
Fax: +49 721608-47779


Luminescence and Squeezing of a Superconducting Light Emitting Diode

Luminescence and Squeezing of a Superconducting Light Emitting Diode

Patrik Hlobil, Peter P. Orth


preprint: arXiv:1502.05075

Date: 19.02.2015

We investigate a semiconductor p-n junction in contact with superconducting leads that is operated under forward bias as a light-emitting diode. The presence of superconductivity results in a significant increase of the electroluminescence in a certain frequency window. We demonstrate that the tunneling of Cooper pairs induces an additional luminescence peak on resonance. There is a transfer of superconducting to photonic coherence which results in the emission of entangled photon pairs and squeezing of the fluctuations in the quadrature amplitudes of the emitted light. The squeezing angle can be electrically manipulated by changing the relative phase of the order parameters in the superconductors. We finally derive the conditions for lasing in the system and show that the laser threshold is reduced due to superconductivity. This shows how macroscopic coherence of a superconductor can be used to control the properties of light.