Feasibility study of a coherent feedback squeezer
Shota Yokoyama, Daniel Peace, Warit Asavanant, Takeyoshi Tajiri, Ben, Haylock, Moji Ghadimi, Mirko Lobino, Elanor H. Huntington, Hidehiro Yonezawa
TL;DR
This paper explores a simple, robust, and broadband quantum squeezer using coherent feedback control, analyzing its stability and fabrication tolerances for practical optical device implementation.
Contribution
It introduces a feasibility framework for designing coherent feedback squeezers, applicable beyond optical systems, focusing on stability and fabrication tolerances.
Findings
Stable feedback conditions identified for device design
Design tolerances quantified for practical implementation
Formalism applicable to various bosonic systems
Abstract
We investigate a coherent feedback squeezer that uses quantum coherent feedback (measurement-free) control. Our squeezer is simple, easy to implement, robust to the gain fluctuation, and broadband compared to the existing squeezers because of the negative coherent feedback configuration. We conduct a feasibility study that looks at the stability conditions for a feedback system to optimize the designs of real optical devices. The feasibility study gives fabrication tolerance necessary for designing and realizing the actual device. Our formalism for the stability analysis is not limited to optical systems but can be applied to the other bosonic systems.
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