17 research outputs found
Interaction of a quantum-dot cavity system with acoustic phonons: Stronger light-matter coupling can reduce the visibility of strong coupling effects
We present a numerically complete study of the combined dynamics of a quantum dot exciton coupled to a single quantized cavity mode and a continuum of acoustic phonons. We demonstrate that acoustic phonons have a pronounced impact on effects characteristic of the strong light-matter coupling regime, such as vacuum Rabi oscillations and collapse and revival scenarios. This impact is considerable already at zero temperature, where initially no phonons are present. Counterintuitively it is found that an increase of the light-matter coupling does not necessarily enhance the visibility of strong-coupling effects. In fact, for typical experimental situations, a stronger light-matter coupling will considerably reduce the visibility.Superconductivity in quantum-size regim
Dephasing in the adiabatic rapid passage in quantum dots:Role of phonon-assisted biexciton generation
Swing-Up of Quantum Emitter Population Using Detuned Pulses
The controlled preparation of the excited state in a quantum emitter is a
prerequisite for its usage as single-photon sources - a key building block for
quantum technologies. In this paper we propose a coherent excitation scheme
using off-resonant pulses. In the usual Rabi scheme, these pulses would not
lead to a significant occupation. This is overcome by using a frequency
modulated pulse to swing up the excited state population. The same effect can
be obtained using two pulses with different strong detunings of the same sign.
We theoretically analyze the applicability of the scheme to a semiconductor
quantum dot. In this case the excitation is several meV below the band gap,
i.e., far away from the detection frequency allowing for easy spectral
filtering, and does not rely on any auxiliary particles such as phonons. Our
scheme has the potential to lead to the generation of close-to-ideal photons.Comment: 10 pages, 7 figure