Środowiskowe Seminarium z Informacji i Technologii Kwantowych

Optimal excitation of a three-level ladder-type atom by a two-photon light state is analyzed using the Wigner-Weisskopf approximation. The optimal state, enabling perfect excitation with unit probability, is determined by the lifetimes of atomic states, with its entanglement dependent on their ratio. Two distinct interaction regimes are identified, in which entanglement affects the excitation process differently.

The optimal light state is an entangled photon pair. As such states may be challenging to prepare, comparisons are made with experimentally accessible photon pair profiles, whose parameters are optimized to maximize excitation probability. The influence of entanglement on atom excitation and its dependence on atomic properties are discussed.