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.

Quantum Information and Measurement (QIM)Jan 1, 20211 citation

arXiv:1605.06281 · Nature Nanotechnology

A semiconductor photon-sorter

Anthony J. Bennett, James P. Lee, David J. Ellis, Ian A. Farrer, D. A. Ritchie, Andrew J. Shields

Published Jul 15, 2016• 50 citations

arXiv HTML PDF

DOI: 10.1038/nnano.2016.113

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An increase in the dimension of state space for quantum key distribution (QKD) can decrease its fidelity requirements while also increasing its bandwidth. A significant obstacle for QKD with qu

d

its (

d\geq 3

) has been an efficient and practical quantum state sorter for photons whose complex fields are modulated in both amplitude and phase. We propose such a sorter based on a multiplexed thick hologram, constructed e.g. from photo-thermal refractive (PTR) glass. We validate this approach using coupled-mode theory with parameters consistent with PTR glass to simulate a holographic sorter. The model assumes a three-dimensional state space spanned by three tilted planewaves. The utility of such a sorter for broader quantum information processing applications can be substantial.