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math.OA2025
On regions of mixed unitarity for semigroups of unital quantum channels
B V Rajarama Bhat, Repana Devendra
It is established that both discrete and continuous semigroups of unital quantum channels are eventually mixed unitary. This result is novel even for the subclass of Schur maps and…
math.OA2024
On the rank of extremal marginal states
Repana Devendra, Pankaj Dey, Santanu Dey
Let and be two states on and respectively. The marginal state space, denoted by , is the set of all states $…