5 citations · 9 across the 7 of their papers we have counts for
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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…
math.FA2002★ 5 cited
Orthogonal polynomials in several variables. I
T. Constantinescu
In this paper we introduce and discuss some classes of orthogonal polynomials in several non-commuting variables. The emphasis is on a non-commutative version of the orthogonal pol…
math.FA2002
Tensor algebras and displacement structure. II. Noncommutative Szego polynomials
T. Constantinescu, J. L. Johnson
In this paper we continue to explore the connection between tensor algebras and displacement structure. We focus on recursive orthonormalization and we develop an analogue of the S…