| 释义 |
ket Also known as Dirac notation, the bra and ket notation highlights the difference between a wave function being thought of as a vector or a functional. So bra(φ) = ⟨φ| is a functional, in the dual space, acting on states ψ by ⟨φ| : ψ↦⟨φ,ψ⟩, whereas ket(φ) = |φ⟩ represents a quantum state. Here ⟨,⟩ denotes the inner product.
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