Tunable vector beam decoder by inverse design for high-dimensional quantum key distribution with 3D polarized spatial modes

• URL: http://arxiv.org/abs/2304.12296v2
• Date: Tue, 25 Apr 2023 04:57:33 GMT
• Title: Tunable vector beam decoder by inverse design for high-dimensional quantum key distribution with 3D polarized spatial modes
• Authors: Eileen Otte (1), Alexander D. White (2), Nicholas A. G\"usken (1), Jelena Vu\v{c}kovi\'c (2), Mark L. Brongersma (1) ((1) Geballe Laboratory for Advance Materials, Stanford University, Stanford, CA, USA, (2) E. L. Ginzton Laboratory, Stanford University, Stanford, CA, USA)
• Abstract summary: We present an approach to include all three spatial dimensions of electric field oscillation in quantum key distribution (QKD) by implementing our tunable, on-a-chip vector beam decoder (VBD) VBD pioneers the "preparation" and "measurement" of three-dimensionally polarized mutually unbiased basis states for high-dimensional (HD) QKD.
• Score: 42.60602838972598
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Spatial modes of light have become highly attractive to increase the dimension and, thereby, security and information capacity in quantum key distribution (QKD). So far, only transverse electric field components have been considered, while longitudinal polarization components have remained neglected. Here, we present an approach to include all three spatial dimensions of electric field oscillation in QKD by implementing our tunable, on-a-chip vector beam decoder (VBD). This inversely designed device pioneers the "preparation" and "measurement" of three-dimensionally polarized mutually unbiased basis states for high-dimensional (HD) QKD and paves the way for the integration of HD QKD with spatial modes in multifunctional on-a-chip photonics platforms.

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