Henry Quentir 10/1/26 Henry Quentir 10/1/26

Brazil's Army Inaugurated a 12 km Quantum Key Distribution Link Between CITEx and the Ministry of Defense on 30 September 2026: What the Rede Quandanga Demonstration Shows and What It Leaves Open

On September 30, 2026 the Brazilian Army switched on a 12 km quantum key distribution link between its Integrated Telematics Center, CITEx, and the Ministry of Defense in Brasília, the longest of its kind on that fiber in Brazil according to the Army's October 1 release. We read the release and the Defesa em Foco account: an imported QKD unit paired with a Brazilian encryptor by the Instituto Militar de Engenharia, a launch-day demonstration in which a conventional channel was breached under simulated intrusion while the quantum link flagged and stopped it, and a research line that ran 40 km of spooled fiber before this hop. It is a defensive capability at rung 6, with authentication, assurance of the imported device and published key-rate and uptime figures still ahead, and the UK NCSC's QKD caveats frame what a program office should ask next.

Henry Quentir 9/22/26 Henry Quentir 9/22/26

Cyprus University of Technology Reports 99.1 Percent Mean Scheduled-Link Availability Across a Seven-Node QKD Network Over Existing Nicosia Fiber for 73 Days, arXiv 21 September 2026

Seven researchers at the Cyprus University of Technology deployed a seven-node quantum key distribution network over 42 kilometers of existing government fiber in Nicosia and ran it for 73 days, generating 119.4 gigabits of secret key with 99.1 percent mean scheduled-link availability using commercial QKD units, encryptors and a proprietary key manager. We read what a trusted-node ring joined to a second cluster by one optical switch lets a government do, why the posture is defensive, and why the publication's limited implementation and audit evidence stands between this metropolitan QKD network and independent assessment by a program office.

Henry Quentir 8/20/26 Henry Quentir 8/20/26

The Raw Material of Quantum Radar Arrives at Room Temperature

MIT researchers report in Nature Electronics a cavity-magnonic device that generates paired correlated microwave signals at room temperature: a yttrium iron garnet film on a printed circuit board splits one pump photon into two outputs at distinct frequencies with a strongly correlated phase relationship. A close look at why the dilution refrigerator has kept quantum illumination radar and correlation-assisted links confined to laboratories, what a warm pair source changes for whom, and the honest distance between strong correlations on a bench and the entangled, target-ranging quantum radar a program office could rely on.

Henry Quentir 8/19/26 Henry Quentir 8/19/26

A Quantum Key Crosses From Fiber to Open Air Without a Trusted Node

A Tel Aviv University team, with the Hebrew University and HEQA Security, demonstrated end-to-end quantum key distribution across a hybrid channel: telecom fiber joined to outdoor free-space links of 90 and 750 meters, with the encoding converted all-optically so the junction never reads the key. A close look at what removing the trusted node means for military and critical-infrastructure networks, who gains on each side of the seam, and the engineering and doctrinal distance still separating a rooftop demonstration from a quantum-secure communications procurement.

Henry Quentir 8/8/26 Henry Quentir 8/8/26

Entanglement Survives 62 Kilometers of Ordinary Aerial Fiber

A NIST, Joint Quantum Institute and Qunnect team sustained entanglement distribution across a 24-hour trial, at 92.8 percent uptime, over 62 kilometers of noisy aerial telecom fiber, moving quantum key distribution links from bespoke builds toward existing infrastructure.

Henry Quentir 8/2/26 Henry Quentir 8/2/26

Chicago Shows Quantum Links Can Share Busy Fiber

A 24.4-kilometer trial shows quantum networking can share installed fiber with high-capacity classical traffic, while repeaters and multi-hop service remain ahead.