Electromagnetically Induced Transparency and Autler–Townes Splitting in a Superconducting Quantum Circuit with a Four-Level V-Type Energy Spectrum
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- Li, H., Ge, G., Liao, L. et al. Found Phys (2015) 45: 198. doi:10.1007/s10701-014-9861-6
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We investigate electromagnetically induced transparency (EIT) and Autler–Townes splitting (ATS) in a superconducting quantum circuit with a four-level V-type energy spectrum constructed by two coupled superconducting charge qubits. We show that it is possible for this four-level superconducting system to exhibit multiple dips in the absorption spectrum of a probe field, with at most three dips resulting from a combination of two ATS subsystems, which indicates the breakdown of the traditional correspondence between a \((N+1)\)-level system and \(N-1\) dips. It is also shown that the switching from EIT to ATS can be realized in a three-level ladder-type subsystem.