Electromagnetically induced transparency in indirectly coupled high-temperature superconducting resonators

In this letter, electromagnetically induced transparency (EIT) is implemented in the microwave region with an experimental system composed of two indirectly coupled high-temperature superconducting resonators. The transition condition between EIT and Autler-Townes splitting is analyzed, giving a physical explanation of this transition based on the superposition of dressed modes in a three-level system. Benefit from the ultra-low loss of superconducting circuit, it is experimentally shown that either EIT or Autler-Townes splitting can be explicitly achieved through control of the detuning between the two resonators and a group delay as high as 5 mu s is obtained for the EIT case. This work suggests that high temperature superconducting circuit is a concise and explicit platform for investigating indirectly coupled resonators with standing-wave modes and the physical mechanism underneath coherence phenomena in the microwave region. In this study, electromagnetically induced transparency (EIT) is achieved in the microwave region using an experimental setup consisting of two indirectly coupled high-temperature superconducting resonators. A physical explanation is provided for the transition between EIT and Autler-Townes splitting based on the superposition of dressed modes in a three-level system. The experimental results matched the theoretical calculations, demonstrating the feasibility of explicitly controlling EIT and achieving a high group delay of up to 5 mu s. This work offers a promising device for delaying and storing electromagnetic waves and shows potential for future applications in remote sensing due to the sensitivity of EIT to resonant frequencies. image