Swing-Up of Quantum Emitter Population Using Detuned Pulses

The controlled preparation of the excited state in a quantum emitter is a for its usage as single-photon sources - a key building block for technologies. In this paper we propose a coherent excitation scheme off-resonant pulses. In the usual Rabi scheme, these pulses would not to a significant occupation. This is overcome by using a frequency pulse to swing up the excited state population. The same effect can obtained using two pulses with different strong detunings of the same sign. theoretically analyze the applicability of the scheme to a semiconductor dot. In this case the excitation is several meV below the band gap,.e., far away from the detection frequency allowing for easy spectral, and does not rely on any auxiliary particles such as phonons. Our has the potential to lead to the generation of close-to-ideal photons.