Selective transport of atomic excitations in a driven chiral-coupled atomic chain

Jen, H. H.

doi:10.1088/1361-6455/ab04c1

Cited by 17 publications

(13 citation statements)

References 66 publications

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“…Our work on the simplest possible coupled system, that of a dimer, helps to provide insight into more complicated systems, such as chirally coupled chains [93][94][95][96][97][98][99]. Our results also pave the way for future work on chirally coupled metasurfaces, as the young field of chiral quantum optics continues to evolve.…”

Section: Discussionmentioning

confidence: 84%

Asymmetric coupling between two quantum emitters

et al. 2020

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We study a prototypical model of two coupled two-level systems, where the competition between coherent and dissipative coupling gives rise to a rich phenomenology. In particular, we analyze the case of asymmetric coupling, as well as the limiting case of chiral (or one-way) coupling. We investigate various quantum optical properties of the system, including its steady-state populations, power spectrum, and second-order correlation functions, and outline the characteristic features which emerge in each quantity as one sweeps through the nontrivial landscape of effective complex couplings. Most importantly, we reveal instances of population trapping, unexpected spectral features, and strong emission correlations.

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Section: Discussionmentioning

confidence: 84%

Asymmetric coupling between two quantum emitters

et al. 2020

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“…An alternative approach that allows subradiant states to emerge for large ratios a/λ is changing the radiation field's boundary conditions by placing, e.g. a surface or a waveguide [33,[55][56][57][58][59][60][61][62] near the atoms, which in turn modifies the exchange interaction and dissipation. Another experimental challenge is the preparation of the subradiant wave packets.…”

Section: Discussionmentioning

confidence: 99%

Subradiance-protected excitation transport

2019

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We explore excitation transport within a one-dimensional chain of atoms where the atomic transition dipoles are coupled to the free radiation field. When the atoms are separated by distances smaller or comparable to the wavelength of the transition, the exchange of virtual photons leads to the transport of the excitation through the lattice. Even though this is a strongly dissipative system, we find that the transport is subradiant, that is, the excitation lifetime is orders of magnitude longer than the one of an individual atom. In particular, we show that a subspace of the spectrum is formed by subradiant states with a linear dispersion relation, which allows for the dispersionless transport of wave packets over long distances with virtually zero decay rate. Moreover, the group velocity and direction of the transport can be controlled via an external uniform magnetic field while preserving its subradiant character. The simplicity and versatility of this system, together with the robustness of subradiance against disorder, makes it relevant for a range of applications such as lossless energy transport and long-time light storage.

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“…Due to the isolation from the environment, subradiant modes have been shown to be useful in transport of excitations [64][65][66][67]. Recent work has explored light transport for closely spaced atoms in arrays with topological edge states [68,69] and in a onedimensional (1D) chain or ring [70][71][72].…”

Section: Introductionmentioning

confidence: 99%

Subradiance-protected excitation spreading in the generation of collimated photon emission from an atomic array

Ballantine

2020

Phys. Rev. Research

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We show how an initial localized radiative excitation in a two-dimensional array of cold atoms can be converted into highly-directional coherent emission of light by protecting the spreading of the excitation across the array in a subradiant collective eigenmode with a lifetime orders of magnitude longer than that of an isolated atom. The excitation, which can consist of a single photon, is then released from the protected subradiant eigenmode by controlling the Zeeman level shifts of the atoms. Hence, an original localized excitation which emits in all directions is transferred to a delocalized subradiance-protected excitation, with a probabilistic emission of a photon only along the axis perpendicular to the plane of the atoms. This protected spreading and directional emission could potentially be used to link stages in a quantum information or quantum computing architecture. arXiv:1909.01912v2 [cond-mat.quant-gas]

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Selective transport of atomic excitations in a driven chiral-coupled atomic chain

Cited by 17 publications

References 66 publications

Asymmetric coupling between two quantum emitters

Asymmetric coupling between two quantum emitters

Subradiance-protected excitation transport

Subradiance-protected excitation spreading in the generation of collimated photon emission from an atomic array

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