Synthesizing In-Bulk Topological Corner States via Giant Atoms
- URL: http://arxiv.org/abs/2608.14206v1
- Date: Fri, 14 Aug 2026 11:31:28 GMT
- Title: Synthesizing In-Bulk Topological Corner States via Giant Atoms
- Abstract summary: Corner states in higher-order topological insulators are typically confined to geometric corners, limiting their flexibility for scalable quantum information processing.<n>We propose a scheme to synthesize topological corner states at arbitrary positions within the bulk of a two-dimensional Su-Schrieffer-Heeger lattice by coupling it to giant atoms.<n>We demonstrate that the engineered corner state exhibits high fidelity and spatial localization, remaining robust against realistic disorder.
- Score: 3.6641231031729173
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Corner states in higher-order topological insulators are typically confined to geometric corners, limiting their flexibility for scalable quantum information processing. We propose a scheme to synthesize topological corner states at arbitrary positions within the bulk of a two-dimensional Su-Schrieffer-Heeger (SSH) lattice by coupling it to giant atoms. By engineering an L-shaped multi-point coupling that satisfies the vacancy-like dressed state (VDS) condition, where the photonic wavefunction vanishes at the coupling sites to form an artificial bulk boundary, we derive the conditions for synthesizing a zero-energy corner state at any target position. We demonstrate that the engineered corner state exhibits high fidelity and spatial localization, remaining robust against realistic disorder. Extending to multi-atom networks, we realize a versatile quantum switch via a giant superatom, enabling multi-channel control over 0D corner states and 1D edge states through the dual-resonance condition. Furthermore, we demonstrate the coherent interactions between two giant atoms mediated by VDS-engineered corner states. Governed by a sublattice selection rule, the coupling activates exclusively in intersecting configurations and decays exponentially with distance. Our work establishes a highly reconfigurable platform for embedding topological boundary modes within the bulk, offering a robust pathway for scalable topological quantum networks.
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