Theory of filtered type-II parametric down-conversion in the continuous-variable domain: Quantifying the impacts of filtering
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PhysRevA.90.023823.pdf
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2.36 MB
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Author(s)
Christ, Andreas
Lupo, Cosmo
Reichelt, Matthias
Meier, Torsten
Silberhorn, Christine
Date Issued
August 2014
Journal
Physical Review A
Publisher
American Physical Society
Citation
Christ, Andreas, Cosmo Lupo, Matthias Reichelt, Torsten Meier, and Christine Silberhorn. "Theory of filtered type-II parametric down-conversion in the continuous-variable domain: Quantifying the impacts of filtering." Phys. Rev. A 90, 023823 (August 2014). © 2014 American Physical Society
Version
Final published version
Abstract
Parametric down-conversion (PDC) forms one of the basic building blocks for quantum optical experiments. However, the intrinsic multimode spectral-temporal structure of pulsed PDC often poses a severe hindrance for the direct implementation of the heralding of pure single-photon states or, for example, continuous-variable entanglement distillation experiments. To get rid of multimode effects narrowband frequency filtering is frequently applied to achieve a single-mode behavior. A rigorous theoretical description to accurately describe the effects of filtering on PDC, however, is still missing. To date, the theoretical models of filtered PDC are rooted in the discrete-variable domain and only account for filtering in the low-gain regime, where only a few photon pairs are emitted at any single point in time. In this paper we extend these theoretical descriptions and put forward a simple model, which is able to accurately describe the effects of filtering on PDC in the continuous-variable domain. This developed straightforward theoretical framework enables us to accurately quantify the tradeoff between suppression of higher-order modes, reduced purity, and lowered Einstein–Podolsky–Rosen entanglement, when narrowband filters are applied to multimode type-II PDC.
MIT Department
Massachusetts Institute of Technology. Research Laboratory of Electronics
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.90.023823
