Quantum functionalities via feedback amplification

27 Sep 2019 Rion Shimazu Naoki Yamamoto

Feedback amplification is a key technique for synthesizing various important functionalities, especially in electronic circuits involving op-amps. This paper presents a quantum version of this methodology, where the general phase-preserving quantum amplifier and coherent (i.e., measurement-free) feedback are employed to construct systems that produce several useful functionalities; quantum versions of differentiator, integrator, self-oscillator, and active filters... (read more)

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