Experimental comparison of 3-mode and single-mode coupling over a 1.6-km free-space link

2018 ◽  
Author(s):  
Timothy M. Yarnall ◽  
David J. Geisler ◽  
Gavin Lund ◽  
Curt M. Schieler ◽  
Mark L. Stevens ◽  
...  
Keyword(s):  
Free Space ◽  
Mode Coupling ◽  
Single Mode ◽  
Experimental Comparison

Laser injecting method from free space beam to single-mode fiber using single lens

2014 ◽  
Vol 26 (3) ◽  
pp. 31006
Author(s):  
张世强 Zhang Shiqiang ◽  
张政 Zhang Zheng ◽  
蔡雷 Cai Lei ◽  
瞿谱波 Qu Pubo ◽  
贺敏波 He Minbo
Keyword(s):  
Free Space ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Single Lens

Nonparaxial free-space diffraction from oblique end faces of single-mode optical fibers

2004 ◽  
Vol 29 (20) ◽  
pp. 2366 ◽  
Author(s):  
Hagyong Kihm ◽  
Seung-Woo Kim
Keyword(s):  
Optical Fibers ◽  
Free Space ◽  
Single Mode

scholarly journals Multidimensional entanglement transport through single-mode fiber

2020 ◽  
Vol 6 (4) ◽  
pp. eaay0837 ◽  
Author(s):  
Jun Liu ◽  
Isaac Nape ◽  
Qainke Wang ◽  
Adam Vallés ◽  
Jian Wang ◽  
...  
Keyword(s):  
Hilbert Spaces ◽  
Mode Coupling ◽  
Degrees Of Freedom ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Entangled States ◽  
Spatial Mode ◽  
Alternative Approach ◽  
Spatial Modes ◽  
State Tomography

The global quantum network requires the distribution of entangled states over long distances, with substantial advances already demonstrated using polarization. While Hilbert spaces with higher dimensionality, e.g., spatial modes of light, allow higher information capacity per photon, such spatial mode entanglement transport requires custom multimode fiber and is limited by decoherence-induced mode coupling. Here, we circumvent this by transporting multidimensional entangled states down conventional single-mode fiber (SMF). By entangling the spin-orbit degrees of freedom of a biphoton pair, passing the polarization (spin) photon down the SMF while accessing multiple orbital angular momentum (orbital) subspaces with the other, we realize multidimensional entanglement transport. We show high-fidelity hybrid entanglement preservation down 250 m SMF across multiple 2 × 2 dimensions, confirmed by quantum state tomography, Bell violation measures, and a quantum eraser scheme. This work offers an alternative approach to spatial mode entanglement transport that facilitates deployment in legacy networks across conventional fiber.

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