Photodetection and Induced Squeezing
Traditional photodetection theories usually involve either perturbation expansions or the rotating wave approximation. The first type of approximation is necessarily restricted to inefficient photodetection. The second type has the drawback that it ignores corrections due to virtual quanta. A new technique is introduced here in which a canonical transformation is used to transform the Hamiltonian to one which has no counter-rotating terms. As well as allowing an exact treatment of one-mode photodetection, the theory predicts the existence of squeezing induced by the detector coupling.
KeywordsUnitary Transformation Canonical Transformation Rotate Wave Approximation Minimal Coupling True Ground State
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