Maxime Malnou, University of Colorado, Boulder

Jeudi 5 Janvier 2017 à 14h00
Amphi Holweck, Esc C
1ème etage

Josephson parametric amplifiers for a dark matter axion search

Axions are hypothetical particles that could account for the dark matter present in the universe. In a cavity haloscope such as that housed at Yale, axions may convert to photons, generating power of a few hundred yoctowatts somewhere in the 4 - 12 GHz band [1]. Detecting such a feeble signal over the noise of the electromagnetic vacuum requires state of the art microwave amplifiers, such as Josephson parametric amplifiers (JPA) [2]. In the phase insensitive mode of operation, a JPA operates close to the standard quantum limit, and has been successfully used to look for axions around 5.8 GHz [3,4]. In the phase sensitive mode, it creates a squeezed microwave state, which, upon subsequent measurement, allows the experimentalist to circumvent the standard quantum limit for one of the two signal quadratures. We propose to use this feature to greatly accelerate the search for axionic dark matter [5].
References :
[1] Shokair, T. M., et al, Int. J. Mod. Phys. A 29, 1443004 (2014).
[2] Castellanos-Beltran, M. A., et al. Nature Physics 4.12 (2008) : 929-931.
[3] Brubaker, B. M., et al, arXiv 1610.02580, (2016).
[4] Al Kenany, S., et al, arXiv 1611.07123, (2016)

Haut de page

À lire aussi...

Benjamin W. Heinrich,Freie Universität Berlin

Jeudi 9 Mars 2017 à 14h00 Amphi Holweck, Esc C 1ème etage From paramagnetic atoms to ferromagnetic chains on Pb – Insights in Yu-Shiba-Rusinov (...) 

> Lire la suite...

Matthieu Desjardin

Jeudi 27 Avril 2017 à 14h00 Amphi Holweck, Esc C 1ème etage Synthetic spin-orbit interaction for Majorana devices Abstract : The engineering of (...) 

> Lire la suite...