New posts in Density Operator

Reduced density matrix: Derive or postulate?

Space of density matrix

Why is the standard definition of fidelity unnecessarily complicated?

Interpretation of density matrix

Is idempotency, $\rho^2=\rho$, a necessary and sufficient condition for $\rho$ to be a pure state?

Why can't every quantum state be expressed as a density matrix/operator?

Examples of density operators $\rho=\sum\limits_n p_n|\phi_n\rangle\langle\phi_n|$ in which the states $\{|\phi_n\rangle\}$ are not orthogonal

Is there a clear and intuitive meaning to the eigenvectors and eigenvalues of a density matrix?

What's the intuition behind the Choi-Jamiolkowski isomorphism?

Are there more entangled states or non-entangled ones?