Experimental detection of entanglement in multimode Gaussian states from high-order intensity correlation moments
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866910179864346624 |
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| author | He, Ze-Shan Zhao, Yukuan Tian, Hao-Shu Sun, Kai Xu, Xiao-Ye Li, Chuan-Feng Guo, Guang-Can |
| author_facet | He, Ze-Shan Zhao, Yukuan Tian, Hao-Shu Sun, Kai Xu, Xiao-Ye Li, Chuan-Feng Guo, Guang-Can |
| contents | Quantum universal invariants of a Gaussian state's covariance matrix, which can be derived from intensity correlation moments, have been adopted to characterize the entanglement properties of Gaussian states via the positive partial transpose criterion, also known as the Peres-Horodecki separability criterion. Such intensity correlation moments enable the extraction of information about the covariance matrix without the need for a coherent local oscillator. Here, we experimentally detect the entanglement properties of multimode Gaussian states using high-order\,(up to sixth-order) intensity correlation moments. These multimode Gaussian states are prepared via spontaneous and cascaded parametric down-conversion pumped by a high-peak-energy pulsed laser. Their intensity correlation moments are measured using a pseudo-photon-number-resolving detector constructed through spatial multiplexing of 32 threshold superconducting nanowire single photon detectors. This method is successfully demonstrated for two-mode and three-mode Gaussian states and can be extended to $N$-mode Gaussian states with $N>3$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_27567 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Experimental detection of entanglement in multimode Gaussian states from high-order intensity correlation moments He, Ze-Shan Zhao, Yukuan Tian, Hao-Shu Sun, Kai Xu, Xiao-Ye Li, Chuan-Feng Guo, Guang-Can Quantum Physics Quantum universal invariants of a Gaussian state's covariance matrix, which can be derived from intensity correlation moments, have been adopted to characterize the entanglement properties of Gaussian states via the positive partial transpose criterion, also known as the Peres-Horodecki separability criterion. Such intensity correlation moments enable the extraction of information about the covariance matrix without the need for a coherent local oscillator. Here, we experimentally detect the entanglement properties of multimode Gaussian states using high-order\,(up to sixth-order) intensity correlation moments. These multimode Gaussian states are prepared via spontaneous and cascaded parametric down-conversion pumped by a high-peak-energy pulsed laser. Their intensity correlation moments are measured using a pseudo-photon-number-resolving detector constructed through spatial multiplexing of 32 threshold superconducting nanowire single photon detectors. This method is successfully demonstrated for two-mode and three-mode Gaussian states and can be extended to $N$-mode Gaussian states with $N>3$. |
| title | Experimental detection of entanglement in multimode Gaussian states from high-order intensity correlation moments |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2604.27567 |