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HEPL, founded in 1947 as Stanford's first Independent Laboratory, provides facilities and administrative structure enabling faculty to do research that spans across the boundaries of a single department or school—for example: physics & engineering or physics & biology/medicine. The Independent Laboratory concept, in many ways unique to Stanford, facilitates world-class research and teaching.
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HEPL Seminar
Wednesday, November 2, 2022 3:00pm
Physics and Astrophysics Conference rooms 102/103
Speaker: Yuqi Zhu, Yale University
Title: Toward Rydberg atom-based single-microwave-photon detection in an axion search
Abstract: The axion is a well-motivated solution to the strong charge–parity problem in quantum chromodynamics, and is also a dark matter candidate. It couples extremely weakly to standard model particles and can take on a wide range of masses; both make its direct detection challenging. The most sensitive laboratory experiments, including ADMX, CAPP, and HAYSTAC, make use of the haloscope technique based on axion-photon conversion. Owing to low-noise amplifiers, they are sensitive to microwave powers on the order of 10-24 W in the 0.5-5 GHz range. The field is working on extending axion searches out to 50 GHz (equivalent to 200 μeV) with a similar sensitivity. I will discuss our proposed scheme for Rydberg atom-based single-microwave-photon detectors in high-mass haloscope searches and show some spectroscopy results that allow us to identify relevant Rydberg states in potassium.