S. Rana

collaborators

2 papers

quant-ph2026

CP-preserving channels

Indu Bala, Sourav Das, Swapan Rana

Completely positive (CP) matrices are ubiquitous in modern science and technology with applications in optimization, graph theory, and quantum entanglement. Recently, Johnston \emp…

quant-ph2026

Extremal Marginal States of Maximal Rank in $(d, d + m)$

Indu Bala, Swapan Rana

We study the extreme points of the convex set $C (I ¨ _{1}, I ¨ _{2})$ of bipartite quantum states with fixed marginals $I ¨ _{1}$ and $I ¨ _{2}$ . We construct extreme points in $(d,\,d+m)…

CP-preserving channels

Extremal Marginal States of Maximal Rank in (d,d+m)

Extremal Marginal States of Maximal Rank in $(d, d + m)$