Interaction between polar molecules subject to a far-off-resonant optical field: entangled dipoles up- or down-holding each other

Lemeshko, Mikhail; Friedrich, Břetislav

doi:10.1080/00268976.2012.689868

Cited by 13 publications

(17 citation statements)

References 34 publications

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“…Chemical reactions in such a gas are determined by the rate of tunneling through the long-range barriers [710], which as shown earlier by Bohn and coworkers, is sensitive to external fields. Even more effectively, the long-range repulsive barriers can also be created by dressing molecules with a combination of dc electric and microwave fields [107,108], and far-off resonant laser fields [95,109]. As was shown in refs.…”

Section: B Towards Controlled Chemistrymentioning

confidence: 99%

“…Entanglement can be found in strongly interacting atomic and molecular gases, however it is challenging to generate highly entangled states between weakly interacting particles in a scalable way. Based on the work of Lemeshko and Friedrich [95,109], Herrera et al [808] recently described a one-step method to generate entanglement between polar molecules in the absence of dc electric fields. They showed that alignment-mediated entanglement in a molecular array is long-lived and discussed applications for quantum information processing and quantum metrology.…”

Section: Entanglement Of Molecules and Dipole Arraysmentioning

confidence: 99%

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Manipulation of molecules with electromagnetic fields

et al. 2013

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I. INTRODUCTIONThe past few decades have witnessed remarkable developments of laser techniques setting the stage for new areas of research in molecular physics. It is now possible to interrogate molecules in the ultrafast and ultracold regimes of molecular dynamics and the measurements of molecular structure and dynamics can be made with unprecedented precision. Molecules are inherently complex quantum-mechanical systems. The complexity of molecular structure, if harnessed, can be exploited for yet another step forward in science, potentially leading to technology for quantum computing, quantum simulation, precise field sensors, and new lasers.The goal of the present article is to review the major developments that have led to the current understanding of molecule -field interactions and experimental methods for manipulating molecules with electromagnetic fields. Molecule -field interactions are at the core of several, seemingly distinct, areas of molecular physics. This is reflected in the organization of this article, which includes sections on Field control of molecular beams, External field traps for cold molecules, Control of molecular orientation and molecular alignment, Manipulation of molecules by nonconservative forces, Ultracold molecules and ultracold chemistry, Controlled many-body phenomena, Entanglement of molecules and dipole arrays, and Stability of molecular systems in high-frequency super-intense laser fields. By combining these topics in the same review, we would like to emphasize that all this work is based on the same basic Hamiltonian.This review is also intended to serve as an introduction to the excellent collection of articles appearing in this same-titled volume of Molecular Physics [1-27]. These original contributions demonstrate the latest developments exploiting control of molecules with electromagnetic fields. The reader will be treated to a colourful selection of articles on topics as diverse as Chemistry in laser fields, Quantum dynamics in helium droplets, Effects of microwave and laser fields on molecular motion, Rydberg molecules, Molecular structure in external fields, Quantum simulation with ultracold molecules, and Controlled molecular interactions, written by many of the leading protagonists of these fields.This article is concerned chiefly with the effects of electromagnetic fields on low-energy rotational, fine-structure and translational degrees of freedom. There are several important research areas that are left outside the scope of this paper, most notably the large body of work on the interaction of molecules with attosecond laser pulses and high harmonic generation [28], coherent control of molecular dynamics [29] and optimal control of molecular processes [30]. We limit the discussion of resonant interaction of light with molecules to laser cooling strategies. We do not survey spectroscopy or transfer of population between molecular states. Even with these restrictions, this is a vast area to review, as is apparent from the number of references. We did our best to in...

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Section: B Towards Controlled Chemistrymentioning

confidence: 99%

Section: Entanglement Of Molecules and Dipole Arraysmentioning

confidence: 99%

Manipulation of molecules with electromagnetic fields

et al. 2013

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“…Furthermore, the phenomenon is expected to occur for other types of anisotropic interparticle interactions, such as quadrupole-quadrupole couplings 113,114 or interactions induced by far-off-resonant laser fields 115,116 . We use the dual boson formalism to strongly correlated systems 79,80 .…”

Section: Discussionmentioning

confidence: 99%

Interaction-driven Lifshitz transition with dipolar fermions in optical lattices

Loon¹,

Katsnelson²,

Chomaz

et al. 2016

Phys. Rev. B

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Anisotropic dipole-dipole interactions between ultracold dipolar fermions break the symmetry of the Fermi surface and thereby deform it. Here we demonstrate that such a Fermi surface deformation induces a topological phase transition -so-called Lifshitz transition -in the regime accessible to present-day experiments. We describe the impact of the Lifshitz transition on observable quantities such as the Fermi surface topology, the density-density correlation function, and the excitation spectrum of the system. The Lifshitz transition in ultracold atoms can be controlled by tuning the dipole orientation and -in contrast to the transition studied in crystalline solids -is completely interaction-driven.

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“…The most familiar intrinsic forces of this inter-particle type are the well-known field-independent Casimir-Polder interactions, 5-10 which relate to the van der Waals or dispersion interaction, first characterized in London's calculation (which derived an R -6 dependence): Casimir and Polder's more accurate derivation, based on quantum electrodynamics (QED), revealed an R -7 dependence in the long-range. However, on the presence of a laser beam of sufficient intensity, the form and magnitude of the inter-particle coupling forces may be modified through a phenomenon known as optical binding, [11][12][13][14][15][16][17][18][19] which may override the intrinsic force. Despite a diverse set of optical processes being operational for particle sizes approaching or exceeding the wavelength of the throughput beam, the case of non-contact interactions between 'Rayleigh particles' has a specifically QED origin.…”

Section: Introductionmentioning

confidence: 99%

Sculpting optical energy landscapes for multi-particle nanoscale assembly

Forbes

Andrews

2014

SPIE Proceedings

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To understand the forces and dynamics of two or more neutral particles trapped within an optical beam, careful consideration of the influence of inter-particle forces is required. The well-known, field-independent intrinsic force is known to derive from the Casimir-Polder interaction. However, the magnitude of this force may be over-ridden by the effect known as optical binding, in cases when the laser beam is of sufficient intensity. This binding interaction is completely independent of optomechanical effects relating to optical tweezers, and involves a stimulated (pairwise) forward-scattering process. Unlike the Casimir-Polder coupling, optical binding is not always an attractive force when both particles are in their ground state. Associated with optical binding are potential energy surfaces, which reveal intricate patterns of local minima – sets of positions in which one of the particles will sit at equilibrium (with the other notionally set at the origin). These optical energy landscapes, which can be illustrated by use of contour diagrams, have mostly been considered for systems in which spherical particles are optically bound. The effect of different particle shapes, for example tube-like structures, can also be explored. Moreover, although the theory of conventional optical binding generally assumes situations in which both particles reside in their ground states, new results arise when individual particles are excited to a higher electronic state. Although, in the experimentally most convenient structural configuration (for tumbling spherical particles), pairwise optical binding vanishes in the short-range region, novel effects can arise as a result of non-zero optical binding between three neighbouring particles

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Interaction between polar molecules subject to a far-off-resonant optical field: entangled dipoles up- or down-holding each other

Cited by 13 publications

References 34 publications

Manipulation of molecules with electromagnetic fields

Manipulation of molecules with electromagnetic fields

Interaction-driven Lifshitz transition with dipolar fermions in optical lattices

Sculpting optical energy landscapes for multi-particle nanoscale assembly

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