Tunable Tansparency in Qubit‐Embedded Coupled‐Cavities With Photothermal Effect

ABSTRACT The properties of the output probe field in a qubit‐embedded system containing two coupled cavities are investigated theoretically. A strong pump field and a weak probe field drive the left cavity. The right cavity couples the mechanical oscillator through the photothermal effect. Simultaneously, a qubit couples the right cavity and the mechanical oscillator through Jaynes‐Cummings coupling. Coupled‐resonator induced transparency (CRIT) is realized in the bare coupled cavities firstly. When considering the photothermal effect, photothermally induced transparency (PTIT) can also be achieved. Further, when a qubit is inserted, the qubit‐assisted induced transparency (QIT) is demonstrated. Tunable optical response, along with slow‐fast light at different frequencies, is shown by adjusting the system coupling strengths and frequency detunings. Especially, we demonstrate the group delay in the PTIT can also be manipulated by the photon tunneling between the double cavities.