3 papers
quant-ph2026
Directional pumping of a two-level system by a fluctuation-regulated quantum source
Sarfraj Fency, Rangeet Bhattacharyya
A resonant classical field drives a two-level system coherently and, with ordinary relaxation, produces saturation rather than directional population transfer. Here we show that di…
quant-ph2026
Optimal enhancement of the Overhauser and Solid Effects within a unified framework
Sarfraj Fency, Rangeet Bhattacharyya
The Overhauser effect (OE) and the Solid effect (SE) are two Dynamic Nuclear Polarization techniques. These two-spin techniques are widely used to create nonequilibrium nuclear spi…
math.CO2025
Trees with Prescribed Maximum Degree and Spectral Radius
Fengming Dong, Ruixue Zhang
It is well known that the spectral radius of a tree with at least vertices satisfies , where is the maximum degree of . Le…