第二量子化
[ ψ ^ ( r ) , ψ ^ † ( r ′ ) ] ∓ = δ ( r − r ′ ) {\displaystyle [{\hat {\psi }}({\boldsymbol {r}}),{\hat {\psi }}^{\dagger }({\boldsymbol {r}}')]_{\mp }=\delta ({\boldsymbol {r}}-{\boldsymbol {r}}')}
[ ψ ^ † ( r ) , ψ ^ † ( r ′ ) ] ∓ = [ ψ ^ ( r ) , ψ ^ ( r ′ ) ] ∓ = 0 {\displaystyle [{\hat {\psi }}^{\dagger }({\boldsymbol {r}}),{\hat {\psi }}^{\dagger }({\boldsymbol {r}}')]_{\mp }=[{\hat {\psi }}({\boldsymbol {r}}),{\hat {\psi }}({\boldsymbol {r}}')]_{\mp }=0}