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Journal of Experimental and Theoretical Physics Letters

Strong field effects in the system of two interacting Rydberg atoms

Ivan A. Burenkov, Olga V. Tikhonova

Published May 1, 2011• 0 citations
Publisher

Abstract

The ionization dynamics of two interacting Rydberg atoms in a strong laser field has been investigated. Each atom has been described in the “two discrete levels + continuum” model. Quasienergy states in this system, which describe field-dressed atoms, have been studied. It has been shown that one of the quasienergy states corresponds to the formation of an atomic state stable against ionization, which leads to the interference stabilization regime first observed in the case of individual atoms in [M. V. Fedorov and A. M. Movsesian, J. Phys. B 21 , L155 (1988)]. Methods for creating entangled states in this system have been proposed and the dynamics of entanglement in the process of interaction with the laser field has been analyzed.

DOI
10.1134/s0021364011060038

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The ionization dynamics of two interacting Rydberg atoms in a strong laser field has been investigated. Each atom has been described in the “two discrete levels + continuum” model. Quasienergy states in this system, which describe field-dressed atoms, have been studied. It has been shown that one of the quasienergy states corresponds to the formation of an atomic state stable against ionization, which leads to the interference stabilization regime first observed in the case of individual atoms in [M. V. Fedorov and A. M. Movsesian, J. Phys. B 21 , L155 (1988)]. Methods for creating entangled states in this system have been proposed and the dynamics of entanglement in the process of interaction with the laser field has been analyzed.
Excitation and photoionization of Rydberg wave packets are described. Interference of bound-free transitions from many coherently populated Rydberg levels is shown to affect the dependence of the photoionization probability on the duration of interaction. Strong-field interference effects in such a system are described also. The most important of these is the field-induced interference stabilization of Rydberg atoms in a strong ionizing field. The intensity range in which this effect can exist is determined. The results derived are used for a qualitative model describing supercontinuum emission in the process of multiphoton ionization.
The dynamics a model Rydberg atom prepared initially in a mixed state is investigated in a classical laser field. The possibility of interference stabilization regime is studied and the influence of parameters of initial mixed state on the ionization process is analyzed. In the case when initial atomic mixed state is formed due to entanglement with few-photon non-classical light the possibility to extract the information about initial atomic density matrix from the atomic behavior in the further applied classical laser field is discussed.
The interaction of a model Rydberg atom with a single photon quantum field is investigated. The atom is considered in the model of 'several bound states+continuum', so that the field-induced ionization from initially populated Rydberg states as well as the resonance coupling with a lower-lying bound state are taken into account. The significant suppression of the ionization due to interference mechanism is established and strong entanglement with a quantum field subsystem is found. Methods to control the atomic behavior and to produce strongly entangled atom–photon states are suggested. The possibility to measure the degree of entanglement experimentally is demonstrated.
We present non-perturbative ab initio calculations of resonant two-photon ionization in which the ground state of a complex atom is resonantly coupled by a laser field to two Rydberg states, each of which belongs to a different Rydberg series. As an example, we have studied the resonant two-photon ionization of neon via the 5s and 4d Rydberg states using the R-matrix-Floquet theory. We find that for weak fields, where the Rydberg states are not overlapping, interference effects are already present which lead to a suppression of ionization for a particular laser frequency. For strong fields, the field induced coupling between the two Rydberg states can strongly modify the weak-field behaviour. We give a qualitative explanation of these phenomena by considering the dressed states of a simple three-level model atom coupled to two continua. Finally we show, by varying the intensity, how the Floquet eigenstates corresponding to the ground state and the two Rydberg states of neon are adiabatically connected to the field-free states. © 1995 IOP Publishing Ltd.
The key subject of these lectures is Interference Stabilization (IS) of atoms in a strong laser field. Physics of the phenomenon, its various manifestations, as well as many related subtopics will be discussed. Generalizations to the case of two-colour interference stabilization will be briefly described. As it will be shown, owing to the achievable in this case very high degree of stabilization, the phenomenon appears to be very promising for making progress in such an important field as propagation of laser pulses in a gas medium. Since the first work on IS (Fedorov and Movsesian, 1988), there have been a lot of publications on this subject. I am not going to mention here all the relevant papers.