ArticleNature communications2023
Quantum noise and its evasion in feedback oscillators.
Article in Nature communications, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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Who cites it
2 citing papers in PubMed.
- A First-Principles Thermodynamic Uncertainty Relation for Shortcuts to Adiabaticity.Entropy (Basel, Switzerland) · 2026Article
- Advances in LiDAR Hardware Technology: Focus on Elastic LiDAR for Solid Target Scanning.Sensors (Basel, Switzerland) · 2024Review
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Authors and funding
2 authors.
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Abstract
Feedback oscillators, consisting of an amplifier whose output is partially fed back to its input, provide stable references for standardization and synchronization. Notably, the laser is such an oscillator whose performance can be limited by quantum fluctuations. The resulting frequency instability, quantified by the Schawlow-Townes formula, sets a limit to laser linewidth. Here, we show that the Schawlow-Townes formula applies universally to feedback oscillators beyond lasers. This is because it arises from quantum noise added by the amplifier and out-coupler in the feedback loop. Tracing the precise origin of quantum noise in an oscillator informs techniques to systematically evade it: we show how squeezing and entanglement can enable sub-Schawlow-Townes linewidth feedback oscillators. Our analysis clarifies the quantum limits to the stability of feedback oscillators in general, derives a standard quantum limit (SQL) for all such devices, and quantifies the efficacy of quantum strategies in realizing sub-SQL oscillators.
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Registered trials
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