Quantum noise and its evasion in feedback oscillators
- URL: http://arxiv.org/abs/2304.03716v1
- Date: Fri, 7 Apr 2023 16:20:20 GMT
- Title: Quantum noise and its evasion in feedback oscillators
- Authors: Hudson A. Loughlin and Vivishek Sudhir
- Abstract summary: We study a model of an oscillator realized by an amplifier embedded in a positive feedback loop.
The power and frequency stability of the output are limited by quantum noise added by two elements in the loop: the amplifier, and the out-coupler.
- Score: 0.0
- License: http://creativecommons.org/licenses/by-nc-nd/4.0/
- Abstract: We study an abstract model of an oscillator realized by an amplifier embedded
in a positive feedback loop. The power and frequency stability of the output of
such an oscillator are limited by quantum noise added by two elements in the
loop: the amplifier, and the out-coupler. The resulting frequency instability
gives the Schawlow-Townes formula. Thus the applicability of the
Schawlow-Townes formula is extended to a large class of oscillators, and is
shown to be related to the Haus-Caves quantum noise limit for a linear
amplifier, while identifying the role of quantum noise added at the
out-coupler. By illuminating the precise origin of amplitude and frequency
quantum noise in the output of an oscillator, we reveal several techniques to
systematically evade them.
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