科研之友
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摘要
Using the thermal field dynamics theory to convert the thermal state into a "pure" state in doubled Pock space, we find that the average value of e(fa dagger a) under squeezed thermal state (STS) is just the generating function of Legendre polynomials. Based on this remarkable result, the normalization and photon-number distributions of m-photon added (or subtracted) STSs are conviently obtained as the Legendre polynomials. This new concise method can be expanded to the entangled case.
