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We propose a realization of the quantum transistor for coherent light fieldsfor the fibre-coupled microdisk cavities. We demonstrate by combining numericaland analytical methods that both in strong coupling and bad cavity limits it ispossible to change system's behaviour from being fully transparent to beingfully reflective by varying the amplitude of the external control field. Weremark that tuning the amplitude of the control field is significantly easierin the experimental setting than tuning cavity-atom coupling strength which wassuggested in [Phys. Rev. A 90, 053822 (2014)] for two-level atoms and worksonly in the strong coupling limit. We also demonstrate the possibility ofcontrolling the statistics of the input coherent field with the control fieldwhich opens the venue for obtaining quantum states of light.

Quantum transistor realized with a single $\Lambda$-level atom coupled to the microtoroidal cavity