Microwave controlled ground state coherence in an atom-based optical amplifier

We experimentally investigate and theoretically analyze the effect of microwave controlled atomic ground state coherence on phase-dependent amplification (PDA) an optical probe field. use three hyperfine levels in room temperature 85 Rb atoms, which are cyclically connected by two one electromagnetic show that a simultaneous fulfilment two-photon resonance condition creates three-photon leads to significantly higher 7.5 dB field with visibility 98.8 %. By selectively breaking using microwaves, we reduces bandwidth 5 MHz. Nevertheless, system shows non-zero PDA for large detunings 15 MHz high 66.8 This novel, controllable hybrid-PDA can be potentially used trade-off during transmission phase coherent classical quantum information.