TL;DR
This paper introduces a passive feedback scheme for quantum amplifiers that enhances robustness and minimizes noise, making quantum amplification more practical for real-world quantum technologies.
Contribution
It proposes a simple, passive feedback method using the auxiliary mode to improve robustness and noise performance of quantum amplifiers.
Findings
The feedback scheme significantly increases amplifier robustness.
The method achieves minimum-noise amplification under realistic imperfections.
A broadband nondegenerate parametric amplifier is demonstrated.
Abstract
Quantum amplification is essential for various quantum technologies such as communication and weak-signal detection. However, its practical use is still limited due to inevitable device fragility that brings about distortion in the output signal or state. This paper presents a general theory that solves this critical issue. The key idea is simple and easy to implement: just a passive feedback of the amplifier's auxiliary mode, which is usually thrown away. In fact, this scheme makes the controlled amplifier significantly robust, and furthermore it realizes the minimum-noise amplification even under realistic imperfections. Hence, the presented theory enables the quantum amplification to be implemented at a practical level. Also, a nondegenerate parametric amplifier subjected to a special detuning is proposed to show that, additionally, it has a broadband nature.
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