Apparatus for generating group velocity dispersion and quantum communication system using the same

An apparatus for generating group velocity dispersion (GVD) for a quantum signal, comprising:

• a group velocity dispersion module composed of an optical fiber, the group velocity dispersion module applying group velocity dispersion to at least one channel signal in which information is encoded to adjust a time difference between adjacent two channel signals;
• and
• a controller configured to receive optical fiber length information and control the group velocity dispersion module based on the optical fiber length information,
• wherein the group velocity dispersion module includes:
• an input line into which the quantum signal is input;
• a group velocity dispersion generation line connected to the input line, separating the input quantum signal into a plurality of channel signals in which information is encoded using a plurality of filters, and generating group velocity dispersion according to a line length difference for each channel signal passing through each channel line to adjust a time difference between the channel signals;
• and
• an output line that outputs each channel signal.