Jian Jun Liu Qualifier Exam

Electromagnetically Induced Transparency (EIT) plays a crucial role in quantum sensing by enabling the formation of narrow transparency windows in atomic media. In this talk, we focus on the line-broadening mechanisms in EIT, using a Doppler-free configuration to achieve narrow linewidths. Through numerical simulations based on the density matrix formalism, we explore the effects of various broadening factors on the EIT linewidth, comparing our theoretical predictions with experimental results from warm vapor systems. Our approach demonstrates how Doppler-free setups can significantly reduce linewidths, making them suitable for high-resolution quantum sensing applications. We will discuss the key factors influencing linewidth, including transit-time broadening and the effects of stray magnetic fields, and how they can be mitigated for optimal performance. The insights gained from this comparison between simulation and experiment highlight the potential for improving precision in quantum metrology using EIT.