Let A be the 2× 2 diagonal operator matrix determined by a positive bounded linear operator
A on a Hilbert space. In this paper, we give several upper bounds for the A-numerical radii of …

In this paper, we prove some bounds for the pp‐numerical radius as natural extensions of
certain known bounds for the numerical radius. This complements many recent studies in …

We introduce a new norm on C 2× C 2, where C 2 is the Hilbert-Schmidt class. We study
basic properties of this norm and prove inequalities involving it. As an application of the …

The operation of a quantum computer is considered as a general quantum operation on a
mixed state on many qubits followed by a measurement. The general quantum operation is …

Using a geometric measure of entanglement quantification based on Euclidean distance of
the Hermitian matrices, we obtain the minimum distance between a bipartite bound …