A Josephson radiation comb generator

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2015
Major/Subject
Mcode
Degree programme
Language
en
Pages
1-7
Series
SCIENTIFIC REPORTS, Volume 5
Abstract
We propose the implementation of a Josephson Radiation Comb Generator (JRCG) based on a dc superconducting quantum interference device (SQUID) driven by an external magnetic field. When the magnetic flux crosses a diffraction node of the critical current interference pattern, the superconducting phase undergoes a jump of π and a voltage pulse is generated at the extremes of the SQUID. Under periodic drive this allows one to generate a sequence of sharp, evenly spaced voltage pulses. In the frequency domain, this corresponds to a comb-like structure similar to the one exploited in optics and metrology. With this device it is possible to generate up to several hundreds of harmonics of the driving frequency. For example, a chain of 50 identical high-critical-temperature SQUIDs driven at 1 GHz can deliver up to a 0.5 nW at 200 GHz. The availability of a fully solid-state radiation comb generator such as the JRCG, easily integrable on chip, may pave the way to a number of technological applications, from metrologyto sub-millimeter wave generation.
Description
VK: Low Temperature Laboratory
Keywords
Superconducting properties and materials; Quantum metrology
Other note
Citation
Solinas , P , Gasparinetti , S , Golubev , D & Giazotto , F 2015 , ' A Josephson radiation comb generator ' , Scientific Reports , vol. 5 , 12260 , pp. 1-7 . https://doi.org/10.1038/srep12260