Non-Abelian Thouless pumping in photonic waveguides

Sun, Ye; Zhang, Xu-Lin; Yu, Feng; Tian, Zhen‐Nan; Chen, Qi‐Dai; Sun, Hong–Bo

doi:10.1038/s41567-022-01669-x

Cited by 55 publications

(20 citation statements)

References 44 publications

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“…This structure can be achieved via utilizing femtosecond laser direct writing techniques in potential experiments. [34,37,38] Each waveguide has a diameter of 6 𝜇m and supports only one eigenmode polarized along the x axis. The gap distance g between each waveguide is also deliberately designed to acquire different coupling coefficient 𝜅 and their relationship as a fitting function is plotted in Figure 1c.…”

Section: Theoretical Analysis and Numerical Results Of Encirclement P...mentioning

confidence: 99%

Proximity‐Encirclement of Multiple Exceptional Points in Non‐Hermitian Photonic Waveguides

Shi

Guo

2023

Annalen der Physik

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Conventionally, dynamical encirclement of exceptional points in non‐Hermitian systems is known to manifest a counterintuitive chiral state conversion. However, the prerequisite of such traits enclosing an exceptional point is broken when only encircling its proximity, preserving a still chiral switching. Research on the proximity‐encirclement in multistate systems is lacking. In this paper, a photonic‐waveguide‐array non‐Hermitian system is proposed to investigate the dynamics by encircling two exceptional points or their proximity. A series of encircling trajectories defined by the parametric equations are designed to steer the evolution of photonic modes in waveguides. The wave propagating along the waveguides is also simulated to capture this non‐Hermitian physics. The chiral behavior in proximity‐encirclement contrasts with the familiar encirclement of one exceptional point and exhibits the unexpected occurrence of nonadiabatic transitions. Furthermore, if two exceptional points are sufficiently encircled, the system will evolve to a stable final state earlier, as a symbol of the occurrence of the nonadiabatic transition. Such novel chiral conversion is maintained only if the encircling trajectories are located at adequate proximity.

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Section: Theoretical Analysis and Numerical Results Of Encirclement P...mentioning

confidence: 99%

Proximity‐Encirclement of Multiple Exceptional Points in Non‐Hermitian Photonic Waveguides

Shi

Guo

2023

Annalen der Physik

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“…Since early demonstrations of femtosecond laser as a three-dimensional (3D) processing tool, [1][2][3][4] microdevices with exciting optical, electronic, mechanical, and magnetic functions have been manufactured, [5][6][7][8][9] by which novel concepts from 3D quantum photonic integrated circuits to intelligent micro-robots are enabled. [10][11][12] Much effort in the past decade in this eld has been devoted to improving manufacture resolution, and several tens of nanometer feature sizes, far beyond the optical diffraction limit, have been reported based on multiphoton absorption, 1 stimulation emission depletion, 13,14 fareld-induced near-eld enhancement, 15 and photoexcitation-induced chemical bonding effects. 16 Nevertheless, singleelectron transistors, single-photon emitters, single-atom memory, and quantum-bit devices require higher manufacturing accuracy, i.g., the ability to address single-atom defects complex (SADC) for initiating functions such as single-photon emission, as is still missing.…”

Section: Introductionmentioning

confidence: 99%

Close-to-Atom Scale Laser Manufacturing for 30-Color Turn-key Single-Photon Emitters

Sun

Wang

Fang³

et al. 2023

Preprint

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Atomic and close-to-atom scale manufacturing is now considered an avenue toward single-photon emitters, single-electron transistors, single-atom memory, and quantum-bit devices for future communication, computation, and sensing applications. Laser manufacturing is outstanding to this end for ease of beam manipulation and batch production, and no requirement for photomasks. It is, however, suffering from optical diffraction limit and lacks atomic and close-to-atom scale precision. Herein, we circumvent this limitation by exploiting a threshold tracing-and-lock-in method, whereby the 2-order gap between atomic point defect complexes and optical diffraction limit is surpassed. As a result, bright (up to 10 Mcounts s− 1) single-photon color centers are deterministically created from few-layer hBN with feature size of less than 5 nm and a near-unity yield. Around 94% of them emit monochromatically at around 30 individual wavelengths from 500 nm to 800 nm. A turn-key monochromic single-photon emitter of demanded color is attained by integrating it with 5-V blue laser diodes.

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“…The topological nature of Thouless pumping makes it robust against modest perturbations such as disorder or interaction [5], and has generated widespread interest for its potential applications, such as current standards [6,7] and quantum state transfer [8]. While Thouless pumping remains elusive in electron-based condensed matter systems, it has been recently realized in synthetic systems featuring versatility and controllability, including ultracold atoms [9][10][11][12][13][14], photonic waveguides [15][16][17][18], acoustic waveguides [19,20], and has also been extended to higher dimensions [21,22] and momentum space [23]. Although the integer QHE, topological insulators and Thouless pumping in noninteracting systems have been well understood, some exotic topological states of matter merely exist due to inter-particle interactions [24], such as the fractional QHE [25,26], topological Mott [27] and Kondo insulators [28].…”

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confidence: 99%

Interaction-induced topological pumping in a solid-state quantum system

Tao¹,

Huang²,

Niu³

et al. 2023

Preprint

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As the basis for generating multi-particle quantum correlations, inter-particle interaction plays a crucial role in collective quantum phenomena, quantum phase transitions, and quantum information processing. It can profoundly alter the band structure of quantum many-body systems and give rise to exotic topological phenomena. Conventional topological pumping, which has been well demonstrated in driven linear or noninteracting systems, may break down in the presence of strong interaction. However, the interplay between band topology and interaction could also induce emergent topological pumping of interacting particles, but its experimental realization has proven challenging. Here we demonstrate interaction-induced topological pumping in a solid-state quantum system comprising an array of 36 superconducting qubits. With strong interaction inherent in the qubits and site-resolved controllability of the lattice potential and hopping strength, we realize the topological Thouless pumping of single and two bounded particles. Beyond these topological phenomena with linear or noninteracting counterparts, we also observe topologically resonant tunneling and asymmetric edge-state transport of interacting particles. Our work creates a paradigm for multi-particle topological effects, and provides a new pathway to the study of exotic topological phenomena, many-body quantum transport, and quantum information transfer.

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Non-Abelian Thouless pumping in photonic waveguides

Cited by 55 publications

References 44 publications

Proximity‐Encirclement of Multiple Exceptional Points in Non‐Hermitian Photonic Waveguides

Proximity‐Encirclement of Multiple Exceptional Points in Non‐Hermitian Photonic Waveguides

Close-to-Atom Scale Laser Manufacturing for 30-Color Turn-key Single-Photon Emitters

Interaction-induced topological pumping in a solid-state quantum system

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