Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Laser-Induced Giant Quasi-Molecules in Optical Lattices

Bimalendu Deb, Gershon Kurizki

Published Dec 16, 2000• 0 citations
OpenAlex

Abstract

We analyze atom-atom interactions in optical lattices due to a laser-induced long-range interatomic force which prevails over the usual London-van der-Waals forces. This force, which can be generated by an intense laser field at a wavelength other than that of the lattice-generating laser, is shown to bind pairs of cold atoms trapped at different lattice sites, and cause their translational quantum correlations (spatial entanglement).

Related papers

Laser-Induced Entangled Giant Quasi-Molecules in Optical Lattices

Bimalendu Deb, Gershon Kurizki

We analyze atom-atom interactions in optical lattices due to a laser-induced long-range interatomic force which prevails over the usual London-van der-Waals forces. This force, which can be generated by an intense laser field at a wavelength longer than that of the lattice-generating laser, is shown to bind pairs of cold atoms trapped at different lattice sites, and cause their translational quantum correlations (spatial entanglement).

arXiv:quant-ph/0012079•Dec 16, 2000•0 citations

Dipole and quadrupole forces exerted on atoms in laser fields: The nonperturbative approach

Milan Šindelka, Nimrod Moiseyev, Lorenz S. Cederbaum

Manipulation of cold atoms by lasers has so far been studied solely within the framework of the conventional dipole approximation, and the atom-light interaction has been treated using low order perturbation theory. Laser control of atomic motions has been ascribed exclusively to the corresponding light-induced dipole forces. In this work, we present a general theory to derive the potential experienced by an atom in a monochromatic laser field in a context analogous to the Born-Oppenheimer approximation for molecules in the field-free case. The formulation goes beyond the dipole approximation and gives rise to the field-atom coupling potential terms which so far have not been taken into consideration in theoretical or experimental studies. Contrary to conventional approaches, our method is based upon the many electron Floquet theory and remains valid also for high intensity laser fields (i.e., for a strongly nonperturbative atom-light interaction). As an illustration of the developed theory, we investigate the trapping of cold atoms in optical lattices. We find that for some atoms for specific laser parameters, despite the absence of the dipole force, the laser trapping is still possible due to the electric quadrupole forces. Namely, we show that by using realistic laser parameters one can form a quadrupole optical lattice which is sufficiently strong to trap Ca and Na atoms.

Physical Review A•Nov 29, 2006•13 citations

Simulating quantum-optical phenomena with optical lattices

Carlos Navarrete–Benlloch, Inés de Vega, Diego Porras +1 more

In this article we keep digging into the capabilities of optical lattices as simulators, showing how they can also be a powerful tool for simulating phenomena traditionally linked to quantum-optical systems (a study that we began in de Vega et al., (2008)). The basic idea consists of connecting an atomic state trapped in the optical lattice to a non trapped state through a Raman scheme. The coupling between these two types of atoms (trapped and free) turns out to be similar to that describing light-matter interaction within the rotating-wave approximation, the role of matter and photons being played by the trapped and free atoms, respectively.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)•May 1, 2011•0 citations

Laser-induced forces near a metallic surface

Philippe Grossel, Daniel VAN LABEKE

The purpose of this paper is a theoretical study of forces induced by a laser beam on nonresonant cold atoms in the vicinity of a metallic surface. We use the same quantum electrodynamics formalism to study and compare all the kinds of forces which can occur. In a first step, when no incident light is present, forces are caused by exchanges of virtual photons and we recover the monoatomic Casimir force and the interatomic van der Waals force, modified by surfaces effects. In a second step, a laser beam is present and we calculate the induced gradient force on one atom and the interatomic light-induced force, which is a binding when similar atoms are considered. Laser light creates interference fringes above the metallic surface which induces an energy grating, where individual atoms could be trapped. Then we study the optical binding for various atoms positions in the fringes. We compare these forces near a perfect metallic surface and the same forces in free space.

Physical Review A•Feb 1, 1994•1 citation

Quantum thermal field fluctuation induced corrections to the interaction between two ground-state atoms

Shijing Cheng, Wenting Zhou, Hongwei Yu

Abstract We generalize the formalism proposed by Dalibard, Dupont-Roc, and Cohen-Tannoudji (the DDC formalism) in the fourth order for two atoms in interaction with scalar fields in vacuum to a thermal bath at finite temperature T, and then calculate the interatomic interaction energy of two ground-state atoms separately in terms of the contributions of thermal fluctuations and the radiation reaction of the atoms and analyze in detail the thermal corrections to the van der Waals and Casimir–Polder interactions. We discover a particular region, i.e. λ 3 β 4 ≪ L ≪ λ with L, β and λ denoting the interatomic separation, the wavelength of thermal photons and the transition wavelength of the atoms respectively, where the thermal corrections remarkably render the van der Waals force, which is usually attractive, repulsive, leading to an interesting crossover phenomenon of the interatomic interaction from attractive to repulsive as the temperature increases. We also find that the thermal corrections cause significant changes to the Casimir–Polder force when the temperature is sufficiently high, resulting in an attractive force proportional to TL −3 in the λ ≪ β ≪ L region, and a force that can be either attractive or repulsive and even vanishing in the β ≪ λ ≪ L region depending on the interatomic separation.

arXiv:2201.10296•Communications in Theoretical Physics•Sep 4, 2022•5 citations

Simulating Many-Body Dynamics in Systems of Cold Atoms, Molecules, and Ions

Johannes Schachenmayer, Alexander Pikovski, Bihui Zhu +2 more

Experiments with cold atoms/molecules in optical lattices or trapped ions make it possible to observe quantum many-body dynamics with long-range interactions. We develop numerical techniques for these systems and explore connections between simulatability and entanglement.

Frontiers in Optics•Jan 1, 2014•0 citations
We analyze atom-atom interactions in optical lattices due to a laser-induced long-range interatomic force which prevails over the usual London-van der-Waals forces. This force, which can be generated by an intense laser field at a wavelength other than that of the lattice-generating laser, is shown to bind pairs of cold atoms trapped at different lattice sites, and cause their translational quantum correlations (spatial entanglement).
Manipulation of cold atoms by lasers has so far been studied solely within the framework of the conventional dipole approximation, and the atom-light interaction has been treated using low order perturbation theory. Laser control of atomic motions has been ascribed exclusively to the corresponding light-induced dipole forces. In this work, we present a general theory to derive the potential experienced by an atom in a monochromatic laser field in a context analogous to the Born-Oppenheimer approximation for molecules in the field-free case. The formulation goes beyond the dipole approximation and gives rise to the field-atom coupling potential terms which so far have not been taken into consideration in theoretical or experimental studies. Contrary to conventional approaches, our method is based upon the many electron Floquet theory and remains valid also for high intensity laser fields (i.e., for a strongly nonperturbative atom-light interaction). As an illustration of the developed theory, we investigate the trapping of cold atoms in optical lattices. We find that for some atoms for specific laser parameters, despite the absence of the dipole force, the laser trapping is still possible due to the electric quadrupole forces. Namely, we show that by using realistic laser parameters one can form a quadrupole optical lattice which is sufficiently strong to trap Ca and Na atoms.
In this article we keep digging into the capabilities of optical lattices as simulators, showing how they can also be a powerful tool for simulating phenomena traditionally linked to quantum-optical systems (a study that we began in de Vega et al., (2008)). The basic idea consists of connecting an atomic state trapped in the optical lattice to a non trapped state through a Raman scheme. The coupling between these two types of atoms (trapped and free) turns out to be similar to that describing light-matter interaction within the rotating-wave approximation, the role of matter and photons being played by the trapped and free atoms, respectively.
The purpose of this paper is a theoretical study of forces induced by a laser beam on nonresonant cold atoms in the vicinity of a metallic surface. We use the same quantum electrodynamics formalism to study and compare all the kinds of forces which can occur. In a first step, when no incident light is present, forces are caused by exchanges of virtual photons and we recover the monoatomic Casimir force and the interatomic van der Waals force, modified by surfaces effects. In a second step, a laser beam is present and we calculate the induced gradient force on one atom and the interatomic light-induced force, which is a binding when similar atoms are considered. Laser light creates interference fringes above the metallic surface which induces an energy grating, where individual atoms could be trapped. Then we study the optical binding for various atoms positions in the fringes. We compare these forces near a perfect metallic surface and the same forces in free space.
Abstract We generalize the formalism proposed by Dalibard, Dupont-Roc, and Cohen-Tannoudji (the DDC formalism) in the fourth order for two atoms in interaction with scalar fields in vacuum to a thermal bath at finite temperature T, and then calculate the interatomic interaction energy of two ground-state atoms separately in terms of the contributions of thermal fluctuations and the radiation reaction of the atoms and analyze in detail the thermal corrections to the van der Waals and Casimir–Polder interactions. We discover a particular region, i.e. λ 3 β 4 ≪ L ≪ λ with L, β and λ denoting the interatomic separation, the wavelength of thermal photons and the transition wavelength of the atoms respectively, where the thermal corrections remarkably render the van der Waals force, which is usually attractive, repulsive, leading to an interesting crossover phenomenon of the interatomic interaction from attractive to repulsive as the temperature increases. We also find that the thermal corrections cause significant changes to the Casimir–Polder force when the temperature is sufficiently high, resulting in an attractive force proportional to TL −3 in the λ ≪ β ≪ L region, and a force that can be either attractive or repulsive and even vanishing in the β ≪ λ ≪ L region depending on the interatomic separation.