Implementation of multiplexing in a subcarrier-wave quantum cryptography system

Controlling single-photon detector ID210 with bright light

“…The investigated detector has recently been employed in several QKD experiments [30,31] based on SCW prin- ciple [33]. This QKD scheme is promising as a backbone for large-scale quantum network thanks to its high capability for multiplexing [34,35] and robustness against environmental influence on the optical fiber [32,36,37]. In this type of systems the encoding photons are not directly generated by an attenuated laser source but rather appear on spectral sidebands during a phase modulation of light.…”

An approach for security evaluation and certification of a complete quantum communication system

“…More recently, SCW QKD has been demonstrated as being robust against external conditions affecting the telecom fiber [42], allowing increased spectral density [43,44], and being invariant to telescope rotation in open-air links [45]. Its viability has been experimentally demonstrated for metropolitan area telecommunication lines [46], multi-user [47,48] and software-defined [49] networks.…”

A method of quantum communication using sideband-modulated infrared emission

“…Its distinctive feature is to move the quantum channel to the side frequencies generated as a result of modulation. This ensures high resistance to influence of external factors and spectral efficiency, as well as good indicators in terms of the ratio of the speed of key formation to the distance between sender and receiver blocks 11,12 . However, as part of such type of systems for short and medium distances, single photon detectors based on APD are also used, and resistance to attacks on the measuring equipment of quantum communication systems at side frequencies has not been studied.…”

“…The method was developed by several groups in different practically significant directions. The increase in spectral efficiency due to the formation of several side frequencies simultaneously 11,12 . Methods, solutions and approaches were developed to increase tactical and technical characteristics of quantum communication systems 9,10 .…”