Bright Heralded Single-Photon Superradiance in a High-Density Thin Vapor Cell
- URL: http://arxiv.org/abs/2601.13909v1
- Date: Tue, 20 Jan 2026 12:35:08 GMT
- Title: Bright Heralded Single-Photon Superradiance in a High-Density Thin Vapor Cell
- Authors: Heewoo Kim, Bojeong Seo, Han Seb Moon,
- Abstract summary: Superradiance is a hallmark of cooperative quantum emission, where radiative decay is collectively enhanced by coherence among emitters.<n>We report bright heralded single-photon superradiance via spontaneous four-wave mixing in a 1-mm-long, high-density vapor cell.<n>These findings establish dense thin atomic vapors as a practical, robust medium for realizing superradiant photon sources.
- Score: 0.21847754147782886
- License: http://creativecommons.org/licenses/by-nc-nd/4.0/
- Abstract: Superradiance is a hallmark of cooperative quantum emission, where radiative decay is collectively enhanced by coherence among emitters. Here, extending superradiant effects to photon pair generation from multi-level atoms, two-photon process offers a pathway to novel quantum light sources and a useful case for practical superradiance. We report bright heralded single-photon superradiance via spontaneous four-wave mixing in a 1-mm-long, high-density cesium vapor cell. By reducing the average distance between atoms in the atomic vapor to 0.29 times the idler photon wavelength, we observe a dramatic narrowing of the temporal two-photon wavefunction. This compression of temporal two-photon wavefunction evidences the superradiance of heralded photons in the collective two-photon emission dynamics. Furthermore, our heralded single-photon superradiance is accompanied by a coincidence-to-accidental ratio of 200 and the detected photon-pair counting exceeding 10^6 pairs/s. These findings establish dense thin atomic vapors as a practical, robust medium for realizing superradiant photon sources, with immediate relevance for quantum optics and the development of efficient photonic quantum technologies.
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