(19)
(11) EP 4 799 320 A1

(12)

(43) Date of publication:
02.09.2026 Bulletin 2026/36

(21) Application number: 24768576.1

(22) Date of filing: 11.09.2024
(51) International Patent Classification (IPC): 
H04L 9/08(2006.01)
H04L 9/40(2022.01)
(52) Cooperative Patent Classification (CPC):
H04L 9/0852; H04L 9/0855; H04L 63/0464
(86) International application number:
PCT/EP2024/075386
(87) International publication number:
WO 2025/087609 (01.05.2025 Gazette 2025/18)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA
Designated Validation States:
GE KH MA MD TN

(30) Priority: 25.10.2023 EP 23205770

(71) Applicant: British Telecommunications public limited company
London, Greater London E1 8EE (GB)

(72) Inventor:
  • LORD, Andrew
    London, Greater London E1 8EE (GB)

(74) Representative: British Telecommunications public limited company Intellectual Property Department 
9th Floor One Braham Braham Street
London E1 8EE
London E1 8EE (GB)

   


(54) IMPROVED QKD NETWORK