arXiv subjects

Simone Gasparinetti

Publications and source records attributed to Simone Gasparinetti.

56 records · Page 4Linked to original sources

arXiv2014

Lamb shift enhancement and detection in strongly driven superconducting circuits

It is shown that strong driving of a quantum system substantially enhances the Lamb shift induced by broadband reservoirs which are typical for solid-state devices. By varying drive parameters the impact of environmental vacuum fluctuations with continuous spectral distribution onto system observables can be tuned in a distinctive way. This provides experimentally feasible measurement schemes for the Lamb shift in superconducting circuits based on Cooper pair boxes, where it can be detected either in shifted dressed transition frequencies or in pumped charge currents.

cond-mat.mes-hall↗

arXiv2012

Probing the local temperature of a 2DEG microdomain with a quantum dot: measurement of electron-phonon interaction

We demonstrate local detection of the electron temperature in a two-dimensionalmicrodomain using a quantum dot. Our method relies on the observation that a temperature bias across the dot changes the functional form of Coulomb-blockade peaks. We apply our results to the investigation of electron-energy relaxation at subkelvin temperatures, find that the energy flux from electrons into phonons is proportional to the fifth power of temperature, and give a measurement of the coupling constant.

cond-mat.mes-hall↗