Design of bright, fiber-coupled and fully factorable photon pair sources
From quantum computation to quantum key distribution, many quantum-enhanced applications rely on the ability to generate pure single photons. Even though the process of spontaneous parametric downconversion (SPDC) is widely used as the basis for photon-pair sources, the conditions for pure heralded...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
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IOP Publishing
2010
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| _version_ | 1797089782673702912 |
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| author | Edgar Vicent, L U'Ren, AB Rangarajan, R Osorio, C Torres, J Zhang, L Walmsley, I |
| author_facet | Edgar Vicent, L U'Ren, AB Rangarajan, R Osorio, C Torres, J Zhang, L Walmsley, I |
| author_sort | Edgar Vicent, L |
| collection | OXFORD |
| description | From quantum computation to quantum key distribution, many quantum-enhanced applications rely on the ability to generate pure single photons. Even though the process of spontaneous parametric downconversion (SPDC) is widely used as the basis for photon-pair sources, the conditions for pure heralded single-photon generation, taking into account both spectral and spatial degrees of freedom, have not been fully described. We present an analysis of the spatio-temporal correlations present in photon pairs produced by type-I, non-collinear SPDC. We derive a set of conditions for full factorability in all degrees of freedom—required for the heralding of pure single photons—between the signal and idler modes. In this paper, we consider several possible approaches for the design of bright, fiber-coupled and factorable photon-pair sources. We show through numerical simulations of the exact equations that sources based on: (i) the suppression of spatio-temporal entanglement according to our derived conditions and (ii) a tightly focused pump beam together with optimized fiber-collection modes and spectral filtering of the signal and idler photon pairs, lead to a source brightness of the same order of magnitude. Likewise, we find that both of these sources lead to a drastically higher factorable photon-pair flux, compared to an unengineered source. |
| first_indexed | 2024-03-07T03:09:02Z |
| format | Journal article |
| id | oxford-uuid:b38ad521-abee-4839-b2ac-6e0c0e32cbbd |
| institution | University of Oxford |
| last_indexed | 2024-03-07T03:09:02Z |
| publishDate | 2010 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | oxford-uuid:b38ad521-abee-4839-b2ac-6e0c0e32cbbd2022-03-27T04:19:57ZDesign of bright, fiber-coupled and fully factorable photon pair sourcesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b38ad521-abee-4839-b2ac-6e0c0e32cbbdSymplectic Elements at OxfordIOP Publishing2010Edgar Vicent, LU'Ren, ABRangarajan, ROsorio, CTorres, JZhang, LWalmsley, IFrom quantum computation to quantum key distribution, many quantum-enhanced applications rely on the ability to generate pure single photons. Even though the process of spontaneous parametric downconversion (SPDC) is widely used as the basis for photon-pair sources, the conditions for pure heralded single-photon generation, taking into account both spectral and spatial degrees of freedom, have not been fully described. We present an analysis of the spatio-temporal correlations present in photon pairs produced by type-I, non-collinear SPDC. We derive a set of conditions for full factorability in all degrees of freedom—required for the heralding of pure single photons—between the signal and idler modes. In this paper, we consider several possible approaches for the design of bright, fiber-coupled and factorable photon-pair sources. We show through numerical simulations of the exact equations that sources based on: (i) the suppression of spatio-temporal entanglement according to our derived conditions and (ii) a tightly focused pump beam together with optimized fiber-collection modes and spectral filtering of the signal and idler photon pairs, lead to a source brightness of the same order of magnitude. Likewise, we find that both of these sources lead to a drastically higher factorable photon-pair flux, compared to an unengineered source. |
| spellingShingle | Edgar Vicent, L U'Ren, AB Rangarajan, R Osorio, C Torres, J Zhang, L Walmsley, I Design of bright, fiber-coupled and fully factorable photon pair sources |
| title | Design of bright, fiber-coupled and fully factorable photon pair sources |
| title_full | Design of bright, fiber-coupled and fully factorable photon pair sources |
| title_fullStr | Design of bright, fiber-coupled and fully factorable photon pair sources |
| title_full_unstemmed | Design of bright, fiber-coupled and fully factorable photon pair sources |
| title_short | Design of bright, fiber-coupled and fully factorable photon pair sources |
| title_sort | design of bright fiber coupled and fully factorable photon pair sources |
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