I work in Prof. Rimberg's lab in the Department of Physics and Astronomy at Dartmouth College. The primary focus of my thesis is on ultra-sensitive, quantum-limited electrometry. My broad research interests include circuit-QED, quantum sensing, and two-level system induced noise in open quantum systems.
We extensively collaborate with Prof. Blencowe's group at Dartmouth, and one of my previous projects under his guidance involved theoretical investigations on a cavity-embedded Cooper pair transistor (cCPT). In this work, we used a first-principles, operator scattering approach to study the open system dynamics of cCPT and proposed that the cCPT device can perform quantum-limited linear charge sensing at the single-photon level. However, the observed charge sensitivity of the cCPT is primarily limited by the coupling of intrinsic charge noise to the cavity resulting in resonance fluctuations during the span of a measurement. Hence the next phase involved demonstrating the suppression of this intrinsic bias noise via dynamic feedback control of the system. My current project focuses on utilizing this feedback scheme to enhance the previously reported charge sensitivity of the cCPT closer to the theoretically proposed value mentioned above.