Physics · Quantum Mechanics
A quantum mechanical system is spanned by the non-degenerate eigenstates |a1⟩ and |a2⟩ of a Hermitian operator A with eigenvalues a1 and a2 respectively. What is the expectation value of the operator (A - a1)(A - a2) in the state |ψ⟩ = |a1⟩ + |a2⟩√2?
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- 1(a2 - a1)(a1 - a2)
- 2(a2 - a1)(a1 - a2)2
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