Density Matrices

Some articles on density, density matrices:

Squashed Entanglement - Motivation For Definition of CMI Entanglement
... Now suppose is the density matrix for a tripartite system ... Suppose and, for are density matrices for the systems and, respectively ... It can be shown that the following density matrix Eq.(8) satisfies ...
Memoryless Quantum Channel - Schrödinger Picture
... purely quantum channel is a map Φ between density matrices acting on and with the following properties As required by postulates of quantum mechanics, Φ needs to be linear ... Since density matrices are positive, Φ must preserve the cone of positive elements ... Density matrices are specified to have trace 1, so Φ has to preserve the trace ...
Quantum Jensen–Shannon Divergence
... The generalization of probability distributions on density matrices allows to define quantum Jensen–Shannon divergence (QJSD) ... It is defined for a set of density matrices and probability distribution as where is the von Neumann entropy ... Quantum Jensen–Shannon divergence for and two density matrices is a symmetric function, everywhere defined, bounded and equal to zero only if two density matrices ...