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quant-ph2003
Parametrization of Quantum States and Channels
T. Constantinescu, V. Ramakrishna
In this manuscript, a parametrization of positive matrices together with some of its many applications in quantum information theory is given.
quant-ph2002
Note on purifications of a qubit
Tiberiu Constantinescu, Viswanath Ramakrishna
This work provides a parametrization of the set of purifications of a 2x2 mixed state, and joint purifications (if any) of a given pair of mixed 2x2 states. The former is parametri…