Non-Markovian relaxation effects in transient four-photon spectroscopy

Masaki Aihara

E. Gaižauskas, Audrius Berzanskis, K.‐H. Feller

Virginia O. Lorenz, Steven T. Cundiff

Using transient four-wave mixing, we have observed the relaxation dynamics of a dense potassium vapor whose dephasing time is large compared to the collision duration, revealing a clear transition from non-Markovian to Markovian dynamics.

Z. M. McIntyre, W. A. Coish

We theoretically analyze measurements of the transient field leaving a cavity as a tool for studying non-Markovian dynamics in cavity quantum electrodynamics (QED).Combined with a dynamical decoupling pulse sequence, transient spectroscopy can be used to recover spectral features that may be obscured in the stationary cavity transmission spectrum due to inhomogeneous broadening.The formalism introduced here can be leveraged to perform in situ noise spectroscopy, revealing a robust signature of quantum noise arising from noncommuting observables, a purely quantum effect.

P. F. Liao

J. P. Lavoine, Alex Boeglin, P. Martin +1 more

The transient four-wave mixing signal from a three-level system coupled to a bath of harmonic oscillators is calculated in the short-pulse limit. This allows an examination of the non-Markovian effects on the relaxation processes in the excited levels between which beating occurs. In particular, it is possible to distinguish between oscillations which are due to oscillatory dephasing, a consequence of the memory effects, and oscillations due to the quantum beats. This also allows one to analyze how these two kinds of oscillations are mixed together. We show that we not only have an amplitude modulation of the beats as in the Markovian case but also deformations of the beats for short delays between the exciting light pulses. These deformations are a consequence of the nonequilibrium motion of the surroundings of the system under optical excitation. \textcopyright{} 1996 The American Physical Society.