Ph.D. Candidate: Saptarshi Chaudhuri
Research Advisor: Kent David Irwin
Date: Monday, August 26, 2019
Location: Varian 355
Title: The Dark Matter Radio: A Quantum-Enhanced Search For QCD Axion Dark Matter
The nature of dark matter is one of the great mysteries in physics, providing compelling evidence for the existence of particles beyond the Standard Model. In this defense, I introduce the Dark Matter (DM) Radio, a tunable, lumped-LC oscillator search for axion and hidden-photon dark matter between 1 peV and 1 ueV. The design of DM Radio is motivated from fundamental optimization statements regarding impedance-matching to dark matter and electromagnetic searches subject to the Standard Quantum Limit on phase-insensitive amplification. I describe the DM Radio Pathfinder, the prototype detector using a 4K liquid-helium-cooled resonator that is searching for hidden-photon dark matter between 500 peV and 50 neV. First data from the Pathfinder are presented. I show that the sensitivity of DM Radio can be improved by using techniques evading the Standard Quantum Limit and propose the Radio-Frequency Quantum Upconverter, a device enabling the use of quantum metrology in DM Radio. The ultimate vision for DM Radio, a cubic-meter-volume resonant experiment operating at 10 mK with a 4 Tesla magnetic field and exploiting quantum metrology, is presented. This experiment will enable a probe of the QCD axion between approximately 4 neV and 1 ueV.