Phase-Preserving Linear Amplifiers Not Simulable by the Parametric Amplifier

A. Chia, Michal Hajdušek, Ranjith Nair, Rosario Fazio, L. C. Kwek, Vlatko Vedral

Abstract

It is commonly accepted that a parametric amplifier can simulate a phase-preserving linear amplifier regardless of how the latter is realized [C. M. Caves et al., Phys. Rev. A 86, 063802 (2012)]. If true, this reduces all phase-preserving linear amplifiers to a single familiar model. Here we disprove this claim by constructing two counterexamples. A detailed discussion of the physics of our counterexamples is provided. It is shown that a Heisenberg-picture analysis facilitates a microscopic explanation of the physics. This also resolves a question about the nature of amplifier-added noise in degenerate two-photon amplification.

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• Physical Review Letters - View
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