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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…
quant-ph2025
What is a Gaussian channel, and when is it physically implementable using a multiport interferometer?
Repana Devendra, Tiju Cherian John, K. Sumesh
Quantum Gaussian channels are fundamental models for communication and information processing in continuous-variable quantum systems. This work addresses both foundational aspects…