Electromagnetically induced transparency and Autler-Townes splitting in superconducting flux quantum circuits

Abstract

We study the microwave absorption of a driven three-level quantum system, which is realized by a superconducting flux quantum circuit (SFQC), with a magnetic driving field applied to the two upper levels. The interaction between the three-level system and its environment is studied within the Born-Markov approximation, and we take into account the effects of the driving field on the damping rates of the three-level system. We study the linear response of the driven three-level SFQC to a weak probe field. The linear magnetic susceptibility of the SFQC can be changed by both the driving field and the bias magnetic flux. When the bias magnetic flux is at the optimal point, the transition from the ground state to the second excited state is forbidden and the three-level SFQC has a ladder-type transition. Thus, the SFQC responds to the probe field like natural atoms with ladder-type transitions. However, when the bias magnetic flux deviates from the optimal point, the three-level SFQC has a cyclic transition, thus it responds to the probe field like a combination of natural atoms with ladder-type transitions and natural atoms with $\Lambda$-type transitions. In particular, we provide detailed discussions on the conditions for realizing electromagnetically induced transparency and Autler-Townes splitting in three-level SFQCs.

20 pages, 8 figures

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• Mollow triplet: pump probe single photon spectroscopy of artificial atoms
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• Tunable $\Lambda$-type system made of a superconducting qubit pair
• Characterising Polariton States in Non-Dispersive Regime of Circuit Quantum Electrodynamics
• Tunable quantum interference effects in Floquet two- and three-level systems
• Decoherence-free propagation and ramification of a solitary pulse