Achieving Robust Single-Photon Blockade with a Single Nanotip

Backscattering losses (BSL), arising from intrinsic imperfections or unavoidable external perturbations in optical resonators, can severely impact photonic devices. In single-photon systems, robust quantum correlations against BSL remain largely unexplored despite their significance for various applications. Here, we demonstrate that single-photon blockade (SPB), a purely quantum effect, can be preserved against BSL by introducing a nanotip near a Kerr nonlinear resonator with intrinsic defects. Without the tip, BSL disrupts SPB, but tuning the tip's position restores robustness even under strong BSL. Notably, quantum correlations emerge while the classical mean photon number remains suppressed due to the interplay between resonator nonlinearity and tip-induced optical coupling. Our findings highlight nanoscale engineering as a powerful tool to protect and harness fragile quantum correlations, paving the way for robust single-photon sources and backscattering-immune quantum devices.

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Publication Details

Journal
Nano Letters
Published
2025-03-04
DOI
https://doi.org/10.1021/acs.nanolett.4c05433
Citations
1
Primary Topic
Mechanical and Optical Resonators
Type
article
Field-Weighted Citation Impact
1.25

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Achieving Robust Single-Photon Blockade with a Single Nanotip

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Achieving Robust Single-Photon Blockade with a Single Nanotip

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article en
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Abstract

Backscattering losses (BSL), arising from intrinsic imperfections or unavoidable external perturbations in optical resonators, can severely impact photonic devices. In single-photon systems, robust quantum correlations against BSL remain largely unexplored despite their significance for various applications. Here, we demonstrate that single-photon blockade (SPB), a purely quantum effect, can be preserved against BSL by introducing a nanotip near a Kerr nonlinear resonator with intrinsic defects. Without the tip, BSL disrupts SPB, but tuning the tip's position restores robustness even under strong BSL. Notably, quantum correlations emerge while the classical mean photon number remains suppressed due to the interplay between resonator nonlinearity and tip-induced optical coupling. Our findings highlight nanoscale engineering as a powerful tool to protect and harness fragile quantum correlations, paving the way for robust single-photon sources and backscattering-immune quantum devices.

Nano LettersVol. 25(12)
National University of Defense Technology (CN), Hunan Normal University (CN), University of Michigan (US), Quantum (Australia) (AU), RIKEN (JP), Quantum Chemistry Research Institute (JP), Computing Center (RU), Adam Mickiewicz University in Poznań (PL), Hunan First Normal University (CN)
National Natural Science Foundation of China, Hunan Provincial Science and Technology Department, Ministry of Science and Technology of the People's Republic of China, Narodowe Centrum Nauki, Science and Technology Program of Hunan Province, Japan Science and Technology Agency, RIKEN, Office of Naval Research
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