Photon-pair parasites: Menace or nuisance?

Jacob G. Koefoed, Jesper B. Christensen, Karsten Rottwitt

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


Sources of indistinguishable single photons are a key component of many optical quantum systems such as linear optical quantum computers [1] or quantum communication [2]. Spontaneous four-wave mixing is a promising method for in-fiber photon-pair generation with tailored spectral properties. However, a number of parasitic effects can negatively influence the quality of photons heralded from the pair. In this work, we investigate the impact on the quantum purity of heralded photons of arguably the three most important effects: nonlinear phase modulation (NPM), higher-order dispersion (HOD) and dispersion fluctuations (DF) along the fiber leading to variations in phase matching. For the first time, we directly compare two schemes under each of these effects. The first is the asymmetric scheme in which one of the quantum fields is group-velocity matched to the single pump field while the other walks off [3]. The second is the symmetric collision scheme, which uses two pump fields with different group velocities that pass through each other with each of the two quantum fields copropagating with one of the pumps [4].

Original languageEnglish
Title of host publicationProceedings of 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference
Number of pages1
Publication date1 Jun 2019
Article number8872819
ISBN (Electronic)9781728104690
Publication statusPublished - 1 Jun 2019
Event2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference - ICM Centre of the Munich Trade Fair Centre., Munich, Germany
Duration: 23 Jun 201927 Jun 2019


Conference2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference
LocationICM Centre of the Munich Trade Fair Centre.
SponsorEPS Young Minds, The European Physical Society
Internet address


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