Patent ID: 8810325

Claim:
A quantum interference device comprising: an alkali metal atom that has a plurality of Λ-type 3-level system energy levels; and a light source that emits a plurality of pairs of resonant light to the alkali metal atom, wherein each of the plurality of Λ-type 3-level system energy levels having a pair of ground levels and an excited level, and each of the pair of ground levels and each of the excited level among the plurality of Λ-type 3-level system energy levels being respectively different from each other, each of the plurality of pairs of resonant light having a frequency difference, the frequency difference being different from each other among the plurality of pairs of resonant light in accordance with each of the plurality of Λ-type 3-level system energy levels, and wherein an electromagnetically induced transparency phenomenon occurs in the alkali metal atom by each of the plurality of pairs of resonant light in accordance with each of the plurality of Λ-type 3-level system energy levels.