  We propose the dynamic control of two-color stationary light in a
double-lambda four-level system using electromagnetically induced transparency.
We demonstrate the complete localization of two-color quantum fields inside a
medium using coherence moving gratings resulting from slow-light based
atom-field interactions in backward nondegenerate four-wave mixing processes.
The quantum coherent control of the two-color stationary light opens a door to
deterministic quantum information science which needs a quantum nondemolition
measurement, where the two-color stationary light scheme would greatly enhance
nonlinearity with increased interaction time.
