Journal Article

FZJ-2019-03177

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Interplay Between Kinetic Inductance, Nonlinearity, and Quasiparticle Dynamics in Granular Aluminum Microwave Kinetic Inductance Detectors

Valenti, F. ; Henriques, F. ; Catelani, G.FZJ* ; Maleeva, N. ; Grünhaupt, L. ; von Lüpke, U. ; Skacel, S. T. ; Winkel, P. ; Bilmes, A. ; Ustinov, A. V. ; Goupy, J. ; Calvo, M. ; Benoît, A. ; Levy-Bertrand, F. ; Monfardini, A. ; Pop, I. M. (Corresponding author)

2019
American Physical Society College Park, Md. [u.a.]

This record in other databases:    

Please use a persistent id in citations: http://hdl.handle.net/2128/22250  doi:10.1103/PhysRevApplied.11.054087

Abstract: Microwave kinetic inductance detectors (MKIDs) are thin-film, cryogenic, superconducting resonators. Incident Cooper pair-breaking radiation increases their kinetic inductance, thereby measurably lowering their resonant frequency. For a given resonant frequency, the highest MKID responsivity is obtained by maximizing the kinetic inductance fraction α. However, in circuits with α close to unity, the low supercurrent density reduces the maximum number of readout photons before bifurcation due to self-Kerr nonlinearity, therefore setting a bound for the maximum α before the noise-equivalent power (NEP) starts to increase. By fabricating granular aluminum MKIDs with different resistivities, we effectively sweep their kinetic inductance from tens to several hundreds of pH per square. We find a NEP minimum in the range of 30aW/√Hz at α≈0.9, which results from a trade-off between the onset of nonlinearity and a nonmonotonic dependence of the noise spectral density versus resistivity.

---

Contributing Institute(s):

1. Theoretische Nanoelektronik (PGI-2)
2. JARA Institut Quanteninformation (PGI-11)

Research Program(s):

1. 144 - Controlling Collective States (POF3-144) (POF3-144)

Appears in the scientific report 2019

---

Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---