Topological Phases of Polaritons in a Cavity Waveguide

Downing, C. A.; Sturges, Thomas J.; Weick, Guillaume; Stobińska, Magdalena; Martín‐Moreno, Luis

doi:10.1103/physrevlett.123.217401

Cited by 60 publications

(38 citation statements)

References 104 publications

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“…These quantum waveguides support various exotic correlated states, such as photon bound states [27], novel twilight states [28], and selfinduced localized states [29], which look very promising for storage and processing of quantum information. By arranging the positions of qubits and designing the waveguide structure, the topological edge states have been analyzed in singleexcitation systems [30][31][32][33]. However, exotic effects may emerge in interacting topological systems when two or more particles (or quasiparticle excitations) interact [34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Radiative topological biphoton states in modulated qubit arrays

Zhong

Poshakinskiy

et al. 2020

Phys. Rev. Research

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We study topological properties of bound pairs of photons in spatially-modulated qubit arrays (arrays of two-level atoms) coupled to a waveguide. While bound pairs behave like Bloch waves, they are topologically nontrivial in the parameter space formed by the center-of-mass momentum and the modulation phase, where the latter plays the role of a synthetic dimension. In a superlattice where each unit cell contains three two-level atoms (qubits), we calculate the Chern numbers for the bound-state photon bands, which are found to be (1, −2, 1). For open boundary condition, we find exotic topological bound-pair edge states with radiative losses. Unlike the conventional case of the bulk-edge correspondence, these novel edge modes not only exist in gaps separating the bound-pair bands, but they also may merge with and penetrate into the bands. By joining two structures with different spatial modulations, we find long-lived interface states which may have applications in storage and quantum information processing.

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Section: Introductionmentioning

confidence: 99%

Radiative topological biphoton states in modulated qubit arrays

Zhong

Poshakinskiy

et al. 2020

Phys. Rev. Research

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“…To achieve this rich variety, we allow the coherent and dissipative coupling parameters to be complex quantities. Permitting complex phase degrees of freedom via the coupling parameters is known to greatly increase the depth of physics in quantum systems [29,63], most famously in the Haldane model (where adding complex next-nearest-neighbor hoppings leads to topological nontrivialities [64]). Here we show how modulating the relative strength and the relative phase of the coherent and dissipative couplings allows one to navigate through the landscape of effective couplings, in a manner reminiscent of reservoir engineering [65].…”

Section: Introductionmentioning

confidence: 99%

Asymmetric coupling between two quantum emitters

et al. 2020

Self Cite

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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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“…The reflection phase changes and the Zak phase changes directly govern the topological properties. Analogous to Su-Schrieffer-Heeger (SSH) model in electronic systems 35 , 36 , topological interface-states emerge when two periodic SCRRs with different Zak phases are connected. The detailed calculation and definition are shown in the supplementary information.…”

Section: Resultsmentioning

confidence: 99%

Conjugated topological interface-states in coupled ring resonators

Lin

Chen

Hsueh

2021

Sci Rep

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The optical properties of topological photonics have attracted much interest recently because its potential applications for robust unidirectional transmission that are immune to scattering at disorder. However, researches on topological series coupled ring resonators (T-SCRR) have been much less discussed. The existence of topological interface-states (TIS) in the T-SCRR is described for the first time in this article. An approach has been developed to achieve this goal via the band structure of dielectric binary ring resonators and the Zak phase of each bandgap. It is found that an ultra-high-Q with complete transmission is obtained by the conjugated topological series coupled ring resonators due to the excitation of conjugated topological interface-states, which is different from those in conventional TIS. Furthermore, the problem of transmission decreases resulting from high-Q increases in the traditional photonic system is significantly improved by this approach. These findings could pave a novel path for developing advanced high-Q filters, optical sensors, switches, resonators, communications and quantum information processors.

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Topological Phases of Polaritons in a Cavity Waveguide

Cited by 60 publications

References 104 publications

Radiative topological biphoton states in modulated qubit arrays

Radiative topological biphoton states in modulated qubit arrays

Asymmetric coupling between two quantum emitters

Conjugated topological interface-states in coupled ring resonators

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