Quantum theory of light and noise polarization in nonlinear optics

Details Quantum theory of light and noise polarization in nonlinear optics Quantum theory of light and noise polarization in nonlinear optics

2005-08-16

arxiv.org/abs/quant-ph/0508122v1

Physics

Quantum Physics

4 pages, no figures

Scientific paper

10.1103/PhysRevLett.96.073601

We present a consistent quantum theory of the electromagnetic field in nonlinearly responding causal media, with special emphasis on $\chi^{(2)}$ media. Starting from QED in linearly responding causal media, we develop a method to construct the nonlinear Hamiltonian expressed in terms of the complex nonlinear susceptibility in a quantum mechanically consistent way. In particular we show that the method yields the nonlinear noise polarization, which together with the linear one is responsible for intrinsic quantum decoherence.

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