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In (d) a classical voltage or current signal (in the microwave range) of amplitude Ω p in is fed into the input of the circuit. The superconducting circuit analog of this phenomenon is schematically shown in (d), (e), and (f), where a “box” schematically represents the circuit. However, when both beams are applied simultaneously, as in (c), then the previously absorbing medium becomes transparent for the probe beam Ω p (i.e., transparency is electromagnetically induced by the control field Ω c). Panel (a) schematically shows a medium that strongly absorbs a probe light beam of amplitude Ω p (b) shows the same absorption, but for a control light beam of amplitude Ω c. Using recent experimental data on superconducting qubits (charge, phase, and flux qubits) to demonstrate our approach, we show the possibility of experimentally realizing this proposal.įigure 1Schematic diagram illustrating electromagnetically induced transparency. These dressed relaxation and dephasing rates characterize the reaction of the dressed qubit to an incident probe field. This tunability is due to the dressed relaxation and dephasing rates which vary parametrically with the level-spacing of the original qubit and thus affect the transition properties of the dressed qubit and the susceptibility. In this equivalent system, we find that both the EIT and the EIA can be tuned by controlling the level-spacing of the superconducting qubit and hence controlling the dressed system. In contrast to the usual case, we theoretically study the EIT and EIA in an equivalent three-level system: a superconducting two-level system (qubit) dressed by a single-mode cavity field. Electromagnetically induced transparency and absorption (EIT and EIA) are usually demonstrated using three-level atomic systems.