174 citations · 1.3k across the 43 of their papers we have counts for
44 papers
Optimal quantum-state tomography with known parameters
Dénes Petz, László Ruppert
It is a well-known fact that the optimal POVM for quantum state tomography is the symmetric, informationally complete, positive operator valued measure (SIC-POVM). We investigate t…
Some inequalities for quantum Tsallis entropy related to the strong subadditivity
Dénes Petz, Dániel Virosztek
In this paper we investigate the inequality where is a state on a finite dimensional Hilbert space $\mathcal{H}…
A characterization theorem for matrix variances
Dénes Petz, Dániel Virosztek
Some recent papers formulated sufficient conditions for the decomposition of matrix variances. A statement was that if we have one or two observables, then the decomposition is pos…
Families of completely positive maps associated with monotone metrics
Fumio Hiai, Hideki Kosaki, Denes Petz +1
An operator convex function on (0,\infty) which satisfies the symmetry condition k(1/x) = x k(x) can be used to define a type of non-commutative multiplication by a positive defini…
Convexity of quasi-entropy type functions: Lieb's and Ando's convexity theorems revisited
Fumio Hiai, Denes Petz
Given a positive function on and a non-zero real parameter , we consider a function in three matrices and…
Conditional SIC-POVMs
D. Petz, L. Ruppert, A. Szanto
In this paper we examine a generalization of the symmetric informationally complete POVMs. SIC-POVMs are the optimal measurements for full quantum tomography, but if some parameter…