Related papers: Nonreciprocal quantum photon-pair source with chiral ferroelectric nematics

Nonreciprocal quantum photon-pair source with chiral ferroelectric nematics

URL: http://arxiv.org/abs/2503.11399v1
Date: Fri, 14 Mar 2025 13:42:30 GMT
Title: Nonreciprocal quantum photon-pair source with chiral ferroelectric nematics
Authors: Jin-Tao Pan, Yun-Kun Wu, Ling-Ling Ma, Ning Wang, Xin-Yu Tao, Bo-Han Zhu, Shu Wang, Fang-Wen Sun, Guang-Can Guo, Hui Jing, Xi-Feng Ren, Yan-Qing Lu,
Abstract summary: We experimentally implement a highly-efficient nonreciprocal quantum photon source in a micro/nano-scale helical structured nonlinear optical fluid.<n>We demonstrate up to 22.6 dB isolation in biphoton generation coupled with nonreciprocal quantum polarization states, while maintaining classical optical reciprocity.
Score: 9.15495359361234
License: http://creativecommons.org/licenses/by-nc-sa/4.0/
Abstract: Quantum nonreciprocity-a fundamental phenomenon enabling directional control of quantum states and photon correlations-has long been recognized as pivotal for quantum technologies. However, the experimental realization of nonreciprocal quantum photon-pair generation, as a critical prerequisite for advancing quantum systems, continues to be an outstanding challenge that remains unaddressed in practice. Here, we experimentally implement a highly-efficient nonreciprocal quantum photon source in a micro/nano-scale helical structured nonlinear optical fluid. Intriguing helical quasi-phase matching is achieved by deliberately engineering the pitch of the chiral ferroelectric structure, thus enabling spontaneous parametric down-conversion with record-high brightness (5,801.6 Hz*mW-1, 10,071% enhancement over phase-mismatched systems) and high coincidence-to-accidental ratio, rivaling state-of-the-art centimeter-scale nonlinear crystals. In particular, by tailoring the ferroelectric helix structure with orthogonally aligned head and tail polarization vectors, we demonstrate up to 22.6 dB isolation in biphoton generation coupled with nonreciprocal quantum polarization states, while maintaining classical optical reciprocity. This quantum liquid-crystal-based platform, combining flexible tunability and superior performance of purely quantum nonreciprocity at micro/nano scales, builds a bridge between a wide range of soft-matter systems, nonreciprocal physics, and emerging quantum photonic technologies.

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