A Generalized Schawlow-Townes Limit
Fuente:
arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866917400579932160 |
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| author | Loughlin, Hudson A. Sudhir, Vivishek |
| author_facet | Loughlin, Hudson A. Sudhir, Vivishek |
| contents | We study a class of a feedback oscillators realized by a phase-insensitive amplifier in positive feedback, where either the amplifier or the feedback element may determine the oscillator's linewidth. The spectral purity of the output of such a device originates from basic demands of quantum mechanics and causality. The resulting expression generalizes the Schawlow-Townes limit, which is itself one component of a standard quantum limit for feedback oscillators. Recently realized bad-cavity oscillators such as super-radiant lasers and solid-state masers can saturate this generalized Schawlow-Townes limit. This limit can be surpassed through appropriate quantum engineering: for example by atomic spin squeezing in a super-radiant laser. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_11861 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Generalized Schawlow-Townes Limit Loughlin, Hudson A. Sudhir, Vivishek Quantum Physics Atomic Physics Optics We study a class of a feedback oscillators realized by a phase-insensitive amplifier in positive feedback, where either the amplifier or the feedback element may determine the oscillator's linewidth. The spectral purity of the output of such a device originates from basic demands of quantum mechanics and causality. The resulting expression generalizes the Schawlow-Townes limit, which is itself one component of a standard quantum limit for feedback oscillators. Recently realized bad-cavity oscillators such as super-radiant lasers and solid-state masers can saturate this generalized Schawlow-Townes limit. This limit can be surpassed through appropriate quantum engineering: for example by atomic spin squeezing in a super-radiant laser. |
| title | A Generalized Schawlow-Townes Limit |
| topic | Quantum Physics Atomic Physics Optics |
| url | https://arxiv.org/abs/2501.11861 |