Fiber-based photon-pair source capable of hybrid entanglement in frequency and transverse mode, controllably scalable to higher dimensions.
We have designed and implemented a photon-pair source, based on the spontaneous four wave mixing (SFWM) process in a few-mode fiber, in a geometry which permits multiple, simultaneous SFWM processes, each associated with a distinct combination of transverse modes for the four participating waves. In our source: i) each process is group-velocity-matched so that it is, by design, nearly-factorable, and ii) the spectral separation between neighboring processes is greater than the marginal spectral width of each process. Consequently, there is a direct correspondence between the joint amplitude of each process and each of the Schmidt mode pairs of the overall two-photon state. Our approach permits hybrid entanglement in discrete frequency and in transverse mode, whereby control of the number of supported fiber transverse modes allows scalability to higher dimensions while spectral filtering may be used for straightforward Schmidt mode discrimination.
Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, apdo. postal 70-543, 04510 D.F., México.
D
D
Cruz-Delgado
Centro de Investigaciones en Óptica A.C., León, Guanajuato 37150, México.
R
R
Ramirez-Alarcon
Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, apdo. postal 70-543, 04510 D.F., México.
E
E
Ortiz-Ricardo
Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, apdo. postal 70-543, 04510 D.F., México.
J
J
Monroy-Ruz
Departamento de Óptica, Centro de Investigación Científica y de Educación Superior de Ensenada, Apartado Postal 360 Ensenada, BC 22860, México.
F
F
Dominguez-Serna
Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, apdo. postal 70-543, 04510 D.F., México.
H
H
Cruz-Ramirez
Departamento de Óptica, Centro de Investigación Científica y de Educación Superior de Ensenada, Apartado Postal 360 Ensenada, BC 22860, México.
K
K
Garay-Palmett
Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, apdo. postal 70-543, 04510 D.F., México.
A B
AB
U'Ren