Postulate 1:States State space:Every isolated physical system corresponds to a unit vector in a complex vector space. -Unit vector:2-norm is 1. Such states are called pure states. ·Ve use a weird“ket"notation'〉to denote such a state.Postulate 1: States • State space: Every isolated physical system corresponds to a unit vector in a complex vector space. – Unit vector: ℓ2 -norm is 1. • Such states are called pure states. • We use a weird “ket” notation ⋅ to denote such a state