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<p><a href="page.php?w=self-adjoint_operator">self-adjoint operator</a> of <a href="page.php?w=trace_class_operator">trace</a> one acting on the Hilbert space of the system. A density operator that is a rank-1 projection is known as a pure quantum state, and all quantum states that are not pure are designated mixed. Pure states are also known as wavefunctions. Assigning a pure state to a quantum system implies certainty about the outcome of some measurement on that system. The <a href="page.php?w=state_space">state space</a> of a quantum system</p><p>
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