Regensburg 2022 – scientific programme
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QI: Fachverband Quanteninformation
QI 8: Quantum Sensors and Metrology
QI 8.4: Talk
Wednesday, September 7, 2022, 16:00–16:15, H9
Iterative adaptive spectroscopy with a two-level nanomechanical platform — •Avishek Chowdhury1, Anh Tuan Le1, Hugo Ribeiro3, and Eva M. Weig1,2 — 1Department of Electrical and Computer Engineering, Technical University of Munich, 85748 Garching, Germany — 2Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, 80799, Munich, Germany — 3Department of Physics and Applied Physics,University of Massachusetts Lowell, Lowell, MA 01854, USA
We develop an iterative, adaptive frequency sensing protocol based on Ramsey interferometry of a two-level system. Our scheme allows one to estimate unknown frequencies with a high precision from short, finite signals. It avoids several issues related to processing of decaying signals and reduces the experimental overhead related to sampling. High precision is achieved by enhancing the Ramsey sequence to prepare with high fidelity both the sensing and readout state and by using an iterative procedure built to mitigate systematic errors when estimating frequencies from Fourier transform. Furthermore, we implement the protocol to demonstrate a proof-of-principle study on a classical two-level nanomechanical platform. We demonstrate that the protocol can detect the coupling between two normal modes with an accuracy higher than their individual dissipation rate. Moreover, the protocol can detect small DC fluctuation of the surrounding electrical field around our nanomechanical oscillator.