Investigation of Ti/Pd Bilayer for Single Photon Detection

Author

Taralli, Emanuele ; Portesi, Chiara ; Rocci, Roberto ; Rajteri, Mauro ; Monticone, Eugenio

Author_Institution

Ist. Naz. di Ricerca Metrologica INRIM, Torino, Italy

Volume

19

Issue

3

fYear

2009

fDate

6/1/2009 12:00:00 AM

Firstpage

493

Lastpage

495

Abstract

Transition-edge sensor (TES) microcalorimeters are promising for application in the field of quantum information and quantum computation thanks to their outstanding single photon detection capabilities. Good energy resolution and photon number discrimination at visible and near-infrared wavelengths make them extensively used as single photon detectors. In this work we report details on the fabrication of Pd/Ti TESs deposited by e-beam evaporation on silicon nitride substrates. We use Pd as alternative to Au layer thanks to its stronger influence on the Ti layer, that allows to obtain the same temperature reduction with thinner layers. The transition temperatures T_c of the devices range from 83 to 110 mK with a transition width DeltaT_c=0.5 mK. Thermal and electric characteristics of Pd/Ti TESs at different temperatures and its capability as single photon sensor are reported.

Keywords

calorimeters; microsensors; palladium; superconducting photodetectors; titanium; Ti-Pd; e-beam evaporation; electric characteristics; energy resolution; near-infrared wavelengths; photon number discrimination; quantum computation; quantum information; single photon detection; single photon sensor; superconducting device fabrication; superconducting radiation detectors; temperature 0.5 mK; temperature 83 mK to 110 mK; temperature reduction; thermal characteristic; transition-edge sensor microcalorimeter; Superconducting device fabrication; superconducting radiation detectors;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2009.2019561

Filename

5067051