3 papers
physics.atom-ph2026
Precision Measurement of the Saturation Intensity in Rubidium at 420 nm
Shivam Sinha, Sumit Achar, Sankar Satheesh +1
The transition of rubidium at nm is a promising candidate for a portable warm-vapor all-optical atomic clock. Despite recent precision spectro…
physics.atom-ph2025
Determination of atomic number density in MEMS vapor cells via single-pass absorption spectroscopy (SPAS)
Sumit Achar, Shivam Sinha, Ezhilarasan M +2
Micro-electro-mechanical systems (MEMS)-based (chip-scale) alkali vapor cells are key components in emerging quantum technologies, where device performance critically depends on th…
quant-ph2023
Generalized -Observational Entropy
Shivam Sinha, Nripendra Majumbdar, S. Aravinda
Traditional measures of entropy, like the Von Neumann entropy, while fundamental in quantum information theory, are insufficient when interpreted as thermodynamic entropy due to th…