Quantum Mechanics (1) · Problem 4.5

The density matrix formulation

Physics — Quantum Mechanics · density-matrix-product-space-operators

Problem

Show that an arbitrary linear operator on a product space H=H1⊗H2H = H_1 \otimes H_2 may be expressed as a linear combination of operators of the form Z=X⊗YZ = X \otimes Y.

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