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Single-Mode Fiber Coupling

This countermeasure involves coupling all quantum states into a single-mode optical fibre before their release into the free-space channel.

[ArteagaDiaz2022]	P. Arteaga-Dıaz, D. Cano, and V. Fernandez. "Practical Side-Channel Attack on Free-Space QKD Systems With Misaligned Sources and Countermeasures" In: IEEE Access 10, 82697–82705. (2022) 10.1109/ACCESS.2022.3196677.
[Nauerth2009]	S. Nauerth, M. F¨urst, T. Schmitt-Manderbach, H. Weier, and H. Weinfurter. "Information leakage via side channels in freespace BB84 quantum cryptography" In: New J. Phys. 11, 065001. (2009) 10.1088/1367-2630/11/6/065001.

QID: CM-0055

Tier: T0

Type: Quantum

Tactic: Harden

Created: 2024-04-15

Updated: 2024-05-10

List of techniques where this countermeasure can be applied.

Description	Technique
Employment of single-mode fiber coupling.	Spatial Misalignment Exploitation in QKD