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Topic: quantum key distribution

A tall equipment rack with instruments, cables and a superconducting nanowire single-photon detector installed for the historical DARPA Quantum Network.

Daderot · The photographer applied CC0 1.0 to the image, waiving copyright and related rights to the extent permitted and allowing copying, modification and distribution, including commercial use, without permission. Credit is retained for editorial transparency. CC0 does not grant patent or trademark rights and does not clear every possible third-party right. No DARPA, BBN, NIST, IonQ or Congruity360 endorsement is implied.

ANALYSIS Quantum

An $8.18 Million Deal Will Test QKD and Post-Quantum Cryptography Together

IonQ and Congruity360 plan to combine physical quantum links with quantum-resistant algorithms. The agreement does not yet demonstrate an operational quantum-safe network.

By Fabianno Intelligence
6 min read

Schematic of a Sagnac twin-field quantum key distribution experiment with three user stations connected around a fiber ring and a central laser and detector station.

Reem Mandil, Yen-An Shih, Abhay Verma, Li Qian and Hoi-Kwong Lo · Figure 1 is part of a preprint explicitly licensed CC BY 4.0. The license permits reproduction, sharing and adaptation, including commercial editorial use, subject to attribution, identification of the license and disclosure of modifications. The exact PNG is proposed for reuse unchanged except possible proportional display resizing. No ShareAlike condition applies. Patent, trademark, privacy and moral rights are not affirmatively licensed, and no endorsement is implied. This attribution records the existing license and does not relicense the figure.

ANALYSIS Quantum

A 127-Kilometer Quantum-Key Ring Drops Phase Locking, Not Every Control Loop

A three-user laboratory network maintained strong optical interference without active phase stabilization, but polarization feedback, backscatter suppression and simulated decoy-state data remain central to the result.

By Fabianno Intelligence
6 min read