Loterre: Astronomía: density operator

theoretical physics aspects > quantum mechanics > operator > linear operator > density operator

density operator

In quantum mechanics, a density matrix (or density operator) is a matrix that describes the quantum state of a physical system. It allows for the calculation of the probabilities of the outcomes of any measurement performed upon this system, using the Born rule. It is a generalization of the more usual state vectors or wavefunctions: while those can only represent pure states, density matrices can also represent mixed states. Mixed states arise in quantum mechanics in two different situations: first when the preparation of the system is not fully known, and thus one must deal with a statistical ensemble of possible preparations, and second when one wants to describe a physical system which is entangled with another, as its state can not be described by a pure state. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Density_matrix)

http://data.loterre.fr/ark:/67375/MDL-K5K6GGDV-8

RDF/XML TURTLE JSON-LD última modificación 24/4/23

LOTERRE