0508122v1

related topics
{energy, gaussian, time}
{light, field, probe}
{force, casimir, field}
{photon, photons, single}
{equation, function, exp}
{operator, operators, space}
{state, states, coherent}
{time, systems, information}
{state, phys, rev}
{phase, path, phys}
{time, decoherence, evolution}

Quantum theory of light and noise polarization in nonlinear optics

Stefan Scheel, Dirk-Gunnar Welsch

abstract: 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.

oai_identifier:
oai:arXiv.org:quant-ph/0508122
categories:
quant-ph
comments:
4 pages, no figures
doi:
10.1103/PhysRevLett.96.073601
arxiv_id:
quant-ph/0508122
created:
2005-08-16

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