Electromagnetically Induced Transparency and Autler–Townes Splitting in a Superconducting Quantum Circuit with a Four-Level V-Type Energy Spectrum

• Published in: Foundations of physics Vol. 45; no. 2; pp. 198 - 210
• Main Authors: Li, Haichao, Ge, Guoqin, Liao, Lingmin, Feng, Shunbin
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.02.2015
• Subjects: Classical and Quantum Gravitation; Classical Mechanics; History and Philosophical Foundations of Physics; Philosophy of Science; Physics; Physics and Astronomy; Quantum Physics; Relativity Theory; Statistical Physics and Dynamical Systems; Four-level superconducting quantum circuit; Electromagnetically induced transparency; Autler–Townes splitting
• ISSN: 0015-9018; 1572-9516
• DOI: 10.1007/s10701-014-9861-6

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.