Journal of Mathematical Physics
Baker–Campbell–Hausdorff formulas are exceedingly useful for disentangling operators so that they may be more easily evaluated on particular states. We present such a disentangling theorem for general bilinear and linear combinations of multiple boson creation and annihilation operators. This work generalizes a classical result of Schwinger.
“A Schwinger Disentangling Theorem,” D. J. Cross and R. Gilmore, Journal of Mathematical Physics 51, 103515 (2010).