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Enhancement of squeezing in an electromagnetically induced transparent system using a microwave field

We investigate the output squeezing of a squeezed vacuum as a probe field propagating through a collection of Λ-type atoms by using a microwave field to drive the dipole-forbidden transition constructed by the ground states. It is found that when the microwave field is increased, the degree of the output squeezing for a squeezed vacuum can be enhanced and the squeezing regions in the frequency domain become wider. In particular, the output squeezing from a shot noise can be produced by adjusting the microwave field. Meanwhile the electromagnetically induced transparency of the quantum field is also optimized. This can be useful in controllable quantum communication.