Photons occupying multiple spatial modes hold a great promise for implementing high-dimensional quantum communication. We use spontaneous four-wave mixing to generate multimode photon pairs in a few-mode fiber. We show the photons are correlated in the fiber mode basis using an all-fiber mode sorter. Our demonstration offers an essential building block for realizing high-dimensional quantum protocols based on standard, commercially available fibers, in an all-fiber configuration.
Bibliographical noteFunding Information:
The authors kindly thank Hagai Eisenberg and Avi Pe’er for many fruitful discussions and suggestions. This research was supported by the United States-Israel Binational Science Foundation (BSF) (Grant No. 2017694). K.S. and Y.B. acknowledge the support of the Israeli Council for Higher Education, the Israel National Quantum Initiative (INQI), and the Zuckerman STEM Leadership Program.
© 2022, The Author(s).