Patent ID: 7539422

Claim:
An optical transmitter/receiver system having an optical transmitter comprising: a quantum state generator having one light source as a pump source; a modulator that superimposes a signal on a quantum state that is output from the quantum state generator to provide a signal light; a polarization controller for the signal light that is output from the modulator; an optical delay unit that adjusts an optical path length of a reference light which is a non-quantum light that is emitted from the quantum state generator; a polarization controller for the reference light; and a polarizing beam coupler that couples the signal light and the reference light whose polarizations are orthogonal to each other where the signal light and the reference light are spatially and temporally superimposed on each other and the signal light is trapped by the reference light in the optical fibers connecting the transmitter with the receiver through the third-order nonlinear effect of the optical fibers.