Multi-photon absorption limits to heralded single photon sources.
Multi-photon absorption limits to heralded single photon sources.
复制标题
多光子吸收对预示单光子源的限制。
DOI:
10.1038/srep03087
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发表时间:
2013-11-04
影响因子:
4.6
通讯作者:
Eggleton, Benjamin J.
中科院分区:
文献类型:
--
作者:
Husko, Chad A.;Clark, Alex S.;Collins, Matthew J.;De Rossi, Alfredo;Combrie, Sylvain;Lehoucq, Gaelle;Rey, Isabella H.;Krauss, Thomas F.;Xiong, Chunle;Eggleton, Benjamin J.
Single photons are of paramount importance to future quantum technologies, including quantum communication and computation. Nonlinear photonic devices using parametric processes offer a straightforward route to generating photons, however additional nonlinear processes may come into play and interfere with these sources. Here we analyse spontaneous four-wave mixing (SFWM) sources in the presence of multi-photon processes. We conduct experiments in silicon and gallium indium phosphide photonic crystal waveguides which display inherently different nonlinear absorption processes, namely two-photon (TPA) and three-photon absorption (ThPA), respectively. We develop a novel model capturing these diverse effects which is in excellent quantitative agreement with measurements of brightness, coincidence-to-accidental ratio (CAR) and second-order correlation function g(2)(0), showing that TPA imposes an intrinsic limit on heralded single photon sources. We build on these observations to devise a new metric, the quantum utility (QMU), enabling further optimisation of single photon sources.
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通讯作者:
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