Electromagnetically induced transparency in indirectly coupled high‐temperature superconducting resonators

Abstract

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 μs 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.

Topological Photonic Crystal in Microwave Region Based on Coupled Superconducting Resonators

“…Antenna design [41,48,54,61,69] Robustness [6,27,30,37,41,48] Coupled resonant microcavities [5,6,27,41,48,57,[60][61][62][63][64] Band-pass filter [54][55][56]69] Broadband tetherable and anti-electromagnetic interference [55,56,69] Plasma [27,30,37,58] Topological photonics [5,6,[29][30][31]37,38,41,48,60,61] One-way scattering [27,48] Microcavity polaritons [5,[29][30][31] Optical delay line …”

“…Thus, the topological edge states cannot be observed directly, and this limits their applications due to the high losses. Superconducting resonators emerge as an ideal solution for the implementation of states with ultra-low decay rates, and electromagnetically induced transparency with a very large group delay has been observed in a circuit based on both directly and indirectly coupled superconducting resonators [62,63]. Furthermore, both the resonant frequencies and line widths (losses) of each resonator, as well as their coupling strength, can be precisely controlled; thus, three-pathway electromagnetically induced transparency and absorption can be implemented as a set [64].…”