Coherent excitations of a quantum nonlinear oscillator

Vladimir Sazonov

M. Kuzmin, Vladimir Sazonov

Florian Katsch, Andreas Knorr

We report on the optical preparation of coherent superpositions of exciton and biexciton states manifested in temporal nonlinear oscillations in interacting exciton gases.The effect is illustrated for atomically thin semiconductors, where the reflected light reveals these interactions in a unique way.The occurring nonlinear coherent oscillations are counteracted by incoherent excitation-induced dephasing, a phenomenon which originates from a new type of quantum interference between excitons and the twoexciton scattering continuum.To improve the experimental accessibility, we discuss different methods to control the oscillation modulation depth by modifying the mutual interplay of the exciton-biexciton superposition and excitation-induced dephasing.We find that the coherent optical response can be manipulated by the polarization degree of the exciting light field, the laser detuning, external magnetic fields, and quantum coherent feedback.The extraordinary temporal behavior and its control distinguishes the nonlinear coherent oscillations from atomic Rabi oscillations and enables their engineering based on our proposed control schemes.

Brad R. Trees, Elizabeth Segelken

Andrey G. Grozin

W. Leoński, M.W. Jarosik, Radosław Szczȩśniak +2 more

We propose the second-order correlation function g(2) as an indicator of quantum chaotic evolution. We discuss a nonlinear Kerr-like oscillator's system excited by a series of ultra-short coherent pulses. For such model, we study the time-evolution of the function g(2) for various values of the strength of excitation which corresponds to the regular and chaotic behaviors of the classical counterpart of the Kerr-like quantum system.