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PHYSICS PHD DISSERTATION DEFENSE: Saptarshi Chaudhuri

Ph.D. Candidate: Saptarshi Chaudhuri

 

Research Advisor: Kent David Irwin

 

Date: Monday, August 26, 2019

Time: 2pm

Location: Varian 355

 

Title: The Dark Matter Radio: A Quantum-Enhanced Search For QCD Axion Dark Matter

 

Abstract:

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.

 

August 26, 2019 - 2:00pm
Varian 355