Characterization of the multimode nature of single-photon sources based on spontaneous parametric down conversion
- URL: http://arxiv.org/abs/2404.10682v1
- Date: Tue, 16 Apr 2024 15:59:17 GMT
- Title: Characterization of the multimode nature of single-photon sources based on spontaneous parametric down conversion
- Authors: Emil R. Hellebek, Klaus Mølmer, Anders S. Sørensen,
- Abstract summary: Single-photon sources are necessary components for many prospective quantum technologies.
We develop a full multimode description based on the exact Bogoliubov treatment of the down conversion process.
Our findings can be used to guide the design of quantum information protocols based on heralded single-photon sources.
- Score: 0.0
- License: http://creativecommons.org/publicdomain/zero/1.0/
- Abstract: Single-photon sources are necessary components for many prospective quantum technologies. One candidate for a single-photon source is spontaneous parametric down conversion combined with a heralding photon detection. The heralded light pulse from such a source, is typically treated as single-mode, this treatment, however, is incomplete. We develop a full multimode description based on the exact Bogoliubov treatment of the down conversion process. We then provide a perturbative and effective treatment, which illustrates the most important physical mechanisms and permits analytical estimates of the success probability and purity of single-photon states under practical heralding conditions, both without relying on the precise detection time of the heralding photon and when accepting photons only in a narrow window around the time of the detection. This permits us to characterize the emitted light under three different assumptions for the pump pulse. For spontaneous parametric down conversion with a very short pump pulse, we find the single-mode description to be accurate, while for longer pump pulses and continuous pumping, a multimode description is necessary. Our findings can be used to guide the design of quantum information protocols based on heralded single-photon sources, as their performance may depend on the multimode nature of the sources.
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