Patent ID: 7092417

Claim:
A phase-correlation generation method which generates a phase-correlation between a plurality of laser fields, comprising: a step of generating a first laser field having a mixed quantum state represented by a single-mode Glauber coherent state that a phase is completely indeterminate; a step of generating a second laser field having the same quantum state as the aforesaid quantum state; a step of inputting the first laser field and the second laser field to diverging means which demonstrates an effect of a linear optical element or a mutual effect equivalent to this effect; a step of mixing the input first and second laser fields and outputting two quantum states by the diverging means; and a step of performing a quantum continuous measurement by causing absorbers in a quantum state to respectively cross the output two quantum states, and generating a phase-correlation between the first and second laser fields, wherein the phase-correlation is generated between the first and second laser fields when a large quantity of absorption is generated in one of the two quantum states due to the absorbers as a result of the quantum continuous measurement.