Engineered optical nonlinearity for a quantum light source

Details Engineered optical nonlinearity for a quantum light source Engineered optical nonlinearity for a quantum light source

2010-05-18

arxiv.org/abs/1005.3086v2

Optics Express 19, 55 (2011)

Physics

Quantum Physics

7 pages (4 pages + appendices), 5 figures. Minor formatting changes. Fixed typos. Some additional references

Scientific paper

10.1364/OE.19.000055

Single-photon pairs created in the nonlinear process of spontaneous parametric downconversion form the backbone of fundamental and applied experimental quantum information science. Many applications benefit from careful spectral shaping of the single-photon wave-packets. In this paper we tailor the joint spectral wave-function of downconverted photons by modulating the nonlinearity of a poled crystal without affecting the phase-matching conditions. We designed a crystal with a Gaussian nonlinearity profile and confirmed successful wave-packet shaping by two-photon interference experiments. We numerically show how our method can be applied for attaining one of the currently most important goals of single-photon quantum optics, the creation of pure single photons without spectral correlations.

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