Introduction: Dispersion Forces

Buhmann, Stefan Yoshi

doi:10.1007/978-3-642-32484-0_1

Cited by 5 publications

(7 citation statements)

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“…As mentioned, the technique we exploit to describe the body-assisted electromagnetic field and to investigate the collective radiative behavior of our two-atom system embedded in a general macroscopic environment, is based on the Green's tensor formalism [23]. This method has been widely applied in various contexts, ranging from QED to quantum optics since the Green's tensor includes all the properties of the electromagnetic field with which the system interacts.…”

Section: Medium-assisted Field Formalismmentioning

confidence: 99%

“…In addition, the macroscopic QED approach has been exploited to unveil cooperative effects in a twoatoms system in the presence of left-handed media [10] and in determining how the Casimir-Polder interaction energy of a polarizable atom is affected by a metallic surface [29]. In this section, we introduce some properties of the electromagnetic Green's tensor involved, starting with the quantized body-assisted electric field [23,24] …”

Section: Medium-assisted Field Formalismmentioning

confidence: 99%

“…For the purpose of this work, a perfectly reflecting planar surface will be considered as macroscopic environment for the two emitters. The analytical expressions for the bulk and scattering parts of the Green's tensor are, respectively, the free space Green's tensor [23], [24] …”

Section: Medium-assisted Field Formalismmentioning

confidence: 99%

“…In this framework, the main aim of the present paper is to investigate the influence of a structured environment on the collective spontaneous emission of a system of two identical correlated atoms. By using macroscopic quantum electrodynamics [23,24,25] to characterize the electromagnetic field in the presence of macroscopic magnetodielectric objects, the first result we have obtained is an analytical expression for the decay rate of the joint two atom-field system, prepared in their symmetric (antisymmetric) entangled state in terms of the Green's tensor of a general structured environment. We then use this result to analyze the radiative behavior of the two entangled quantum emitters in two specific cases: when they are located in free space for any interatomic distance, so recovering the known superradiant and subradiant features in particular in the subwavelength spatial region; when a perfectly reflecting planar surface is present, showing how its presence significantly affects the physical features of the collective spontaneous emission.…”

Section: Introductionmentioning

confidence: 99%

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Tuning the collective decay of two entangled emitters by means of a nearby surface

Palacino

Passante

Rizzuto

et al. 2017

J. Phys. B: At. Mol. Opt. Phys.

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Abstract.We consider the radiative properties of a system of two identical correlated atoms interacting with the electromagnetic field in its vacuum state in the presence of a generic dielectric environment. We suppose that the two emitters are prepared in a symmetric or antisymmetric superposition of one ground state and one excited state and we evaluate the transition rate to the collective ground state, showing distinctive cooperative radiative features. Using a macroscopic quantum electrodynamics approach to describe the electromagnetic field, we first obtain an analytical expression for the decay rate of the two entangled twolevel atoms in terms of the Green's tensor of the generic external environment. We then investigate the emission process when both atoms are in free space and subsequently when a perfectly reflecting mirror is present, showing how the boundary affects the physical features of the superradiant and subradiant emission by the two coupled emitters. The possibility to control and tailor radiative processes is also discussed.

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Section: Medium-assisted Field Formalismmentioning

confidence: 99%

Section: Medium-assisted Field Formalismmentioning

confidence: 99%

Section: Medium-assisted Field Formalismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tuning the collective decay of two entangled emitters by means of a nearby surface

Palacino

Passante

Rizzuto

et al. 2017

J. Phys. B: At. Mol. Opt. Phys.

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“…Hence the contributions of the vdW force containing the rotatory strength are discriminatory with respect * pablo.barcellona@physik.uni-freiburg.de † salama@wfu.edu ‡ stefan.buhmann@physik.uni-freiburg.de to the handedness of enantiomers [8,15,16]. According to the Curie dissymmetry principle [17], the handedness of an enantiomer can only be detected by means of a second reference object which is also chiral ("It takes a thief to catch a thief").…”

mentioning

confidence: 99%

Enhanced Chiral Discriminatory van der Waals Interactions Mediated by Chiral Surfaces

et al. 2017

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We predict a discriminatory interaction between a chiral molecule and an achiral molecule which is mediated by a chiral body. To achieve this, we generalize the van der Waals interaction potential between two ground-state molecules with electric, magnetic and chiral response to non-trivial environments. The force is evaluated using second-order perturbation theory with an effective Hamiltonian. Chiral media enhance or reduce the free interaction via many-body interactions, making it possible to measure the chiral contributions to the van der Waals force with current technology. The van der Waals interaction is discriminatory with respect to enantiomers of different handedness and could be used to separate enantiomers. We also suggest a specific geometric configuration where the electric contribution to the van der Waals interaction is zero, making the chiral component the dominant effect.PACS numbers: 34.20. Cf, 33.55.+b,42.50.Nn Introduction. Casimir and van der Waals (vdW) forces are electromagnetic interactions between neutral macroscopic bodies and/or molecules due to the quantum fluctuations of the electromagnetic field [1][2][3]. In particular, the attractive vdW potential between two electrically polarisable particles was first derived by Casimir and Polder using the minimal-coupling Hamiltonian [2]. Molecules can also exhibit magnetic [4][5][6][7] and chiral polarisabilities [4,8,9] and their contribution to the vdW force can be repulsive.The aim of this work is the study of the interaction between chiral molecules in the presence of a chiral magneto-dielectric body. Chiral molecules lack any center of inversion nor plane of symmetry. Hence they exist as two distinct enantiomers, left-handed and righthanded, which are related to space inversion. Due to their low symmetry they have distinctive interactions with light. In a chiral solution the refractive indices for circularly polarized light of different handedness are different. Hence a chiral solution can rotate the plane of polarization of light with an angle related to the concentration of the solution (optical rotation) [10][11][12], or absorb left-and right-circularly polarised light at different rates (circular dichroism) [13]. All of these phenomena are related to the optical rotatory strength, defined in terms of electric (d nk ) and magnetic (m nk ) dipole moment matrix elements [14]:

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Optical waveguiding by atomic entanglement in multilevel atom arrays

Asenjo-Garcı́a

Kimble

Chang

2019

Proc. Natl. Acad. Sci. U.S.A.

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The optical properties of sub-wavelength arrays of atoms or other quantum emitters have attracted significant interest recently. For example, the strong constructive or destructive interference of emitted light enables arrays to function as nearly perfect mirrors, support topological edge states, and allow for exponentially better quantum memories. In these proposals, the assumed atomic structure was simple, consisting of a unique electronic ground state. Within linear optics, the system is then equivalent to a periodic array of classical dielectric particles, whose periodicity supports the emergence of guided modes. However, it has not been known whether such phenomena persist in the presence of hyperfine structure, as exhibited by most quantum emitters. Here, we show that waveguiding can arise from rich atomic entanglement as a quantum many-body effect, and elucidate the necessary conditions. Our work represents a significant step forward in understanding collective effects in arrays of atoms with realistic electronic structure.

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Introduction: Dispersion Forces

Cited by 5 publications

References 560 publications

Tuning the collective decay of two entangled emitters by means of a nearby surface

Tuning the collective decay of two entangled emitters by means of a nearby surface

Enhanced Chiral Discriminatory van der Waals Interactions Mediated by Chiral Surfaces

Optical waveguiding by atomic entanglement in multilevel atom arrays

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