Spatial delocalization of cold oscillators in hollow-core fibers
Abstract
Trapped particles in hollow-core fibers enable long-range sensing, though advanced control of their in-fiber motion, such as multimodal cooling and squeezing, remains challenging. Here, we present optical interference-based adaptive techniques for controlling the motion of a fringe-trapped silica nanoparticle inside a fiber. After feedback-cooling its axial and radial motion, we induce axial delocalization (position anti-squeezing) via two complementary approaches. First, non-adiabatic fringe suppression expands the position variance by 11.83 (±0.7) dB to that of the initial cold-state while retaining Gaussian statistics. Second, multi-pass particle positioning at dark fringes increases the delocalization to 13.23 (±0.5) dB relative to the cold-state's variance via dark inverted optical potentials, in agreement with our Wiener stochastic model. Stronger delocalization produces non-Gaussian states of motion. Unlike prior inverted-trap implementations, our method requires neither auxiliary optical traps nor charged particles in Paul traps. Our results demonstrate fringe-trapped particles in hollow-core fibers as a versatile platform for long-range sensing and macroscopic quantum physics.
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BibTeX
@misc{chakraborty2026spatial,
title = {{Spatial delocalization of cold oscillators in hollow-core fibers}},
author = {Soumya Chakraborty and Pardeep Kumar and Gordon K. L. Wong and Claudiu Genes and Nicolas Y. Joly},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.06209},
eprint = {2610.06209},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.06209},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Spatial delocalization of cold oscillators in hollow-core fibers
AU - Soumya Chakraborty
AU - Pardeep Kumar
AU - Gordon K. L. Wong
AU - Claudiu Genes
AU - Nicolas Y. Joly
PY - 2026
DA - 2026/10/08
PB - arXiv
DO - 10.48550/arxiv.2610.06209
UR - https://arxiv.org/abs/2610.06209
AB - Trapped particles in hollow-core fibers enable long-range sensing, though advanced control of their in-fiber motion, such as multimodal cooling and squeezing, remains challenging. Here, we present optical interference-based adaptive techniques for controlling the motion of a fringe-trapped silica nanoparticle inside a fiber. After feedback-cooling its axial and radial motion, we induce axial delocalization (position anti-squeezing) via two complementary approaches. First, non-adiabatic fringe suppression expands the position variance by 11.83 (±0.7) dB to that of the initial cold-state while retaining Gaussian statistics. Second, multi-pass particle positioning at dark fringes increases the delocalization to 13.23 (±0.5) dB relative to the cold-state's variance via dark inverted optical potentials, in agreement with our Wiener stochastic model. Stronger delocalization produces non-Gaussian states of motion. Unlike prior inverted-trap implementations, our method requires neither auxiliary optical traps nor charged particles in Paul traps. Our results demonstrate fringe-trapped particles in hollow-core fibers as a versatile platform for long-range sensing and macroscopic quantum physics.
ER -