Suppression of the relaxation induced by radioactivity in superconducting qubits and Kinetic Inductance Detectors

23 Jul 2019, 17:45
1h 15m
Piazza Città di Lombardia (Milano)

Piazza Città di Lombardia

Milano

Piazza Città di Lombardia, 1, 20124 Milano MI
Poster Low Temperature Detector for quantum technologies and other frontiers Poster session

Speaker

Nicola Casali (ROMA1)

Description

Non-equilibrium quasiparticles can deteriorate the performance of superconducting qubits and Kinetic Inductance Detectors. The former suffer from the loss of coherence, while the latter from low-frequency noise. We are investigating a source of quasiparticles that has been too long neglected, namely radioactivity: cosmic rays, environmental radioactivity, and contaminants in the materials can all generate phonons of energy sufficient to break Cooper pairs and thus increase the number of quasiparticles. In this contribution we describe the status of the project and its perspectives.

Less than 5 years of experience since completion of Ph.D Y
Student (Ph.D., M.Sc. or B.Sc.) N

Primary authors

Laura Cardani (ROMA1) Nicola Casali (ROMA1) Massimiliano Clemenza (MIB) Angelo Cruciani (ROMA1) Luca Gironi Dr Maria Martinez (University of Zaragoza) Stefano Pirro (INFN Laboratori Nazionali del Gran Sasso) Ioan M. Pop (Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany ; Institute of Nanotechnology, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany) Claudia Rusconi (LNGS) Francesco Valenti (Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany; Institut für Prozessdatenverarbeitung und Elektronik, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany) Marco Vignati (ROMA1)

Presentation Materials