Secure quantum communication using frequency hopping

It is claimed a method for secure quantum communication and secure quantum key distribution (QKD), comprising a source (1) and one or more receivers (3) connected with the source (1) via a quantum channel (2) each, comprising the steps,i) generation of a quantum signal (14), preferably in the source (1);ii) transmission of the quantum signal (14) to the one or more receivers (3) via the quantum channel (2) each;iii) detection of the quantum signal (14) at the one or more receivers (3), preferably in a detection means;According to the invention, in step i) frequency hopping at the generation of the quantum signal (14) is realized, preferably by a source (1) hopping means (10), and/orin step iii) frequency hopping at the detection of the quantum signal (14) in the one or more receivers (3) is realized, preferably by a receiver hopping means (30).