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In this paper we propose a new protocol to achieve coherent populationtransfer between two states in a three-level atom by using two ac fields. It isbased on the physics of Stimulated Raman Adiabatic Passage (STIRAP), but it isimplemented with the constraint of a reduced control, namely one of the fieldscannot be switched off. A combination of frequency chirps is used with resonantfields, allowing to achieve approximate destructive interference, despite ofthe fact that an exact dark state does not exist. This new chirped STIRAPprotocol is tailored for applications to artificial atoms, where architectureswith several elementary units can be strongly coupled but where the possibilityof switching on and off such couplings is often very limited. Demonstration ofthis protocol would be a benchmark for the implementation of a class ofmultilevel advanced control procedures for quantum computation and microwavequantum photonics in artificial atoms.

Population transfer in a Lambda system induced by detunings