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Collectively pumped superradiant laser with coherence scaling beyond the standard quantum limit — arXiv:2611.05976

Source: arXiv (en)
Original: https://arxiv.org/abs/2611.05976
License (as archived): CC0-1.0
Archived: 2026-11-05T18:32:50.260Z
SHA-256 of the archived text: 90ac8e150a4939c2e444481e4874f2fdb8fa63fa574c0234b6eb8e3329cab669
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How to cite

Collectively pumped superradiant laser with coherence scaling beyond the standard quantum limit — arXiv:2611.05976 — arXiv (en), https://arxiv.org/abs/2611.05976 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_7ba33f2dfbbb (Metraipolis archive dc_7ba33f2dfbbb, sha256 90ac8e150a4939c2e444481e4874f2fdb8fa63fa574c0234b6eb8e3329cab669)

BibTeX

@misc{dc7ba33f2dfbbb,
  title = {Collectively pumped superradiant laser with coherence scaling beyond the standard quantum limit — arXiv:2611.05976},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2611.05976},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_7ba33f2dfbbb; sha256 90ac8e150a4939c2e444481e4874f2fdb8fa63fa574c0234b6eb8e3329cab669},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2611.05976. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

For more than half a century, the standard quantum limit (SQL) was thought to limit the laser coherence $\mathfrak{C}$ -- the number of photons emitted from the laser into the beam in one coherence time -- to a scaling $\Theta(\mu^2)$, where $\mu$ is the mean number of optical-frequency excitations stored inside the laser. However, recently it has been shown [Baker et al., Nat. Phys. 17, 179 (2021)] that the Heisenberg limit -- an achievable ultimate limit set by quantum mechanics for the task of producing a beam with the standard properties of a laser beam -- is $\mathfrak{C}=\Theta(\mu^4)$, a quadratic enhancement. So far, proposals to demonstrate beyond-SQL scaling of $\mathfrak{C}$ have been limited to circuit QED, at microwave frequencies (i.e., a maser). Here, we introduce a class of generalized far-above-threshold (FAT) laser models, obtained by replacing the ordinary bosonic lowering operator $\hat{a}$ by a general lowering operator $\hat{L}$ in the superoperators appearing in the master equation that governs the FAT laser dynamics. We then show that an optical-frequency superradiant laser in the bad-cavity limit, with feedback-controlled collective pumping, realizes one such model, in which $\hat{L}$ is identified with the collective superradiant lowering operator $\hat{J}$. This model can surpass the SQL scaling, with the coherence exhibiting a scaling as large as $\mathfrak{C}= \Theta(\mu^{8/3})$ in the optimal parameter regime. Here, in the bad-cavity limit, $\mu\approx N/2$, where $N$ is the number of superradiant atoms.

Tema degli esploratori: fisica e astronomia (elenco arXiv quant-ph, nuovi lavori del giorno).
Categorie arXiv: Quantum Physics (quant-ph) ; Atomic Physics (physics.atom-ph); Optics (physics.optics).
Pagina del lavoro: https://arxiv.org/abs/2611.05976 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-11-05T18:22:49.017Z dalla pagina https://arxiv.org/list/quant-ph/new (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).