1. Quantum Fundamentals

Postulates — Quiz

Test your understanding of postulates with 5 practice questions.

Practice Questions

Question 1

Which of the following is NOT a required property of a density operator ρ?

Question 2

In the density matrix formalism, after a projective measurement with projectors {Πᵢ} yields outcome i, what is the post-measurement state ρ'?

Question 3

According to the composite systems postulate, what is the joint density operator of two independent systems with density operators ρ_A and ρ_B?

Question 4

For a time-independent Hamiltonian H, which expression gives the time-evolution operator U(t) in a closed quantum system?

Question 5

Which property of the time-evolution operator U ensures that probabilities and inner products are preserved under evolution?