Optical lattice loaded with cold atoms can exhibit a tunable photonic bandgap for a weak probe field under the conditions of electromagnetically inducedtransparency. This system possesses a number of advantageous properties,including reduced relaxation of Raman coherence and the associated probeabsorption, and simultaneous enhancement of the index modulation and theresulting reflectivity of the medium. This flexible system has a potential toserve as a testbed of various designs for the linear and nonlinear photonicband gap materials at a very low light level and can be employed for realizingdeterministic entanglement between weak quantum fields.
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