25-29 January 2019
US/Pacific timezone

Quantum Amplifiers for the Axion Dark Matter Experiment (ADMX)

28 Jan 2019, 10:35
Building 66- Auditorium (LBL-Hill)

Building 66- Auditorium


Lawrence Berkeley National Lab Berkeley, California
Quantum sensing Sensing II


Dr Gianpaolo Carosi (Lawrence Livermore Natl Lab)


One of the most interesting problems in physics and cosmology today is what makes up dark matter. The QCD axion is a well motivated candidate and is predicted to be very light ($\mu$eV mass) and very cold, meaning it would interact more like a radio wave then an ionizing particle. The Axion Dark Matter Experiment (ADMX) uses the "haloscope technique" to search for axions resonantly converting to detectable photons in a microwave cavity immersed in a strong magnetic field. The critical components for enabling an efficient search for dark matter axions are near quantum limited superconducting amplifiers. Here I will describe the implementation in ADMX of both a Microstrip SQUID amplifiers (MSA) and a Josephson Parameteric Amplifiers (JPAs), both of which were developed at UC Berkeley. These quantum amplifiers enable ADMX to cover the entire range of potential axion couplings for the first time. I will also discuss the potential to use single-photon counting to enable higher frequency axion searches where the standard-quantum limit may become the limiting factor.

Primary author

Dr Gianpaolo Carosi (Lawrence Livermore Natl Lab)

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