Vacuum-Triggered Instability in Paired Superradiance
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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_ | 1866911708659843072 |
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| author | Bai, Zhan Song, Ningqiang Chen, Min An, Xiangyan Shen, Baifei Ji, Liangliang Li, Ruxin |
| author_facet | Bai, Zhan Song, Ningqiang Chen, Min An, Xiangyan Shen, Baifei Ji, Liangliang Li, Ruxin |
| contents | Paired superradiance (PSR) is a macro-coherent two-photon process capable of very large gain, making it promising for detecting ultra-weak signals induced by neutrinos or dark matter. A major goal has been to increase the system volume $V$ and density $n$, since the signal intensity scales as $(nV)^2$. We recast finite PSR as a parametric amplifier driven by the electromagnetic vacuum. The usual zero-field semiclassical initial condition is replaced by vacuum inputs fixed by the quantum two-point function. Combining this formulation with Maxwell--Bloch evolution and finite-length stability analysis, we find that PSR produces an irreducible vacuum background that can develop into macroscopic bursts once the gain-length product exceeds \(ΓL=π/2\) for a sufficient coherence time. These results, together with a closed-form formula for estimating the vacuum-seeded photon yield, establish a previously overlooked constraint for high-gain PSR, with direct implications for proposed neutrino and dark-matter studies. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_23528 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Vacuum-Triggered Instability in Paired Superradiance Bai, Zhan Song, Ningqiang Chen, Min An, Xiangyan Shen, Baifei Ji, Liangliang Li, Ruxin Optics High Energy Physics - Phenomenology Paired superradiance (PSR) is a macro-coherent two-photon process capable of very large gain, making it promising for detecting ultra-weak signals induced by neutrinos or dark matter. A major goal has been to increase the system volume $V$ and density $n$, since the signal intensity scales as $(nV)^2$. We recast finite PSR as a parametric amplifier driven by the electromagnetic vacuum. The usual zero-field semiclassical initial condition is replaced by vacuum inputs fixed by the quantum two-point function. Combining this formulation with Maxwell--Bloch evolution and finite-length stability analysis, we find that PSR produces an irreducible vacuum background that can develop into macroscopic bursts once the gain-length product exceeds \(ΓL=π/2\) for a sufficient coherence time. These results, together with a closed-form formula for estimating the vacuum-seeded photon yield, establish a previously overlooked constraint for high-gain PSR, with direct implications for proposed neutrino and dark-matter studies. |
| title | Vacuum-Triggered Instability in Paired Superradiance |
| topic | Optics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2605.23528 |