Accès ouvert
2026
article
OpenAlex
Carlos Sevilla-Gutiérrez, Varun Raj Kaipalath, Fabian Steinlechner
Photon sources based on spontaneous parametric down-conversion (SPDC) are central to experimental quantum optics and quantum technologies. Their performance is commonly quantified by three metrics: pair-collection probability, heralding efficiency, and spectral purity. In bulk-crystal SPDC, these metrics are known to be mutually …
de
(code pays fourni par la source)
2025
conference-paper
OpenAlex
Monika Monika, Carlos Sevilla-Gutiérrez, Dmitriy Mitin, Idoia Ugarte Olcoz et autres
We present a quantum photonic processor featuring 32 modes, with the potential for further scalability. The system demonstrates robustness against extrinsic phase noise, accounting for temperature and acoustic fluctuations. Our initial objective is to tailor this processor for quantum boson sampling (QBS) …
de
(code pays fourni par la source)
Accès ouvert
2024
article
OpenAlex
Carlos Sevilla-Gutiérrez, Varun Raj Kaipalath, Baghdasar Baghdasaryan, Markus Gräfe et autres
The first color photos of the parametric down-conversion (PDC) emission cone illustrate the correlation of longitudinal and transverse momentum in the process, i.e., wavelength-dependent emission angles of PDC photons. However, current experiments and applications are more conveniently described in terms of discrete …
de
(code pays fourni par la source)
2024
conference-paper
OpenAlex
Carlos Sevilla-Gutiérrez, Purujit Singh Chauhan, Fabian Steinlechner
We model and experimentally demonstrate the full spatiospectral non-linear interference of cascaded SPDC sources using a spectrally dependent Laguerre-Gaussian basis and an arbitrary mode dependent transformation performed by the optical system.
de
(code pays fourni par la source)
2023
conference-paper
OpenAlex
Carlos Sevilla-Gutiérrez, Varun Raj Kaipalath, Fabian Steinlechner
We report an innovative method to shape the spectral properties of the two-photons state in parametric down-conversion by exploiting the spatial-spectral correlations in terms of the spectral dependence of the Laguerre-Gauss spatial basis.
de
(code pays fourni par la source)
2022
article
OpenAlex
Baghdasar Baghdasaryan, Carlos Sevilla-Gutiérrez, Fabian Steinlechner, S. Fritzsche
Spontaneous parametric down-conversion (SPDC) is a widely used source for photonic entanglement. Years of focused research have led to a solid understanding of the process, but a cohesive analytical description of the paraxial biphoton state has yet to be achieved. We derive …
de
(code pays fourni par la source)
Accès ouvert
2022
preprint
OpenAlex
Carlos Sevilla-Gutiérrez, Varun Raj Kaipalath, Baghdasar Baghdasaryan, Markus Gräfe et autres
The first color photos of the parametric down-conversion (PDC) emission cone illustrate the correlation of longitudinal- and transverse momentum in the process, i.e., wavelength-dependent emission angle of PDC photons. However, current experiments and applications are more conveniently described in terms of discrete …
de
(code pays fourni par la source)
Accès ouvert
2021
article
OpenAlex
Zeferino Ibarra-Borja, Roberto Ramírez-Alarcón, Carlos Sevilla-Gutiérrez, Héctor Cruz-Ramírez et autres
In this paper, we directly image the orbital angular momentum (OAM) correlations, expressed in the Bessel-Gauss (BG) basis, present in quantum-entangled photon pairs produced by the process of spontaneous parametric downconversion (SPDC). We use a spatial light modulator that displays an appropriate …
mx
(code pays fourni par la source)
2019
article
OpenAlex
Zeferino Ibarra-Borja, Carlos Sevilla-Gutiérrez, Roberto Ramírez-Alarcón, Héctor Cruz-Ramírez et autres
We present, to the best of our knowledge, the first implementation of full-field quantum optical coherence tomography (FF-QOCT). In our system, we are able to obtain full three-dimensional (3D) information about the internal structure of a sample under study by relying on …
mx
(code pays fourni par la source)
Accès ouvert
2019
article
OpenAlex
Zeferino Ibarra-Borja, Carlos Sevilla-Gutiérrez, Roberto Ramírez-Alarcón, Qiwen Zhan et autres
We present spatially-resolved observations of orbital angular momentum (OAM) conservation, via a Laguerre-Gauss (LG) basis decomposition, of spatially-entangled photon pairs produced in type-I collinear spontaneous parametric downconversion (SPDC). These results were obtained with a novel detection system for OAM-entangled photon pairs that …
mx, us
(code pays fourni par la source)