Linear amplification and quantum cloning for non-Gaussian continuous variables

TL;DR

This paper explores quantum linear amplification for non-Gaussian states, demonstrating that certain nonclassical features, including entanglement, persist at high gain, with implications for quantum cloning beyond Gaussian states.

Contribution

It reveals that non-Gaussian states retain nonclassicality under linear amplification, including entanglement, and discusses implications for quantum cloning outside Gaussian regimes.

Findings

Non-Gaussian states maintain nonclassicality at high gain.

Two-mode entanglement survives linear amplification.

Implications for non-Gaussian quantum cloning are discussed.

Abstract

We investigate phase-insensitive linear amplification at the quantum limit for single- and two-mode states and show that there exists a broad class of non-Gaussian states whose nonclassicality survives even at an arbitrarily large gain. We identify the corresponding observable nonclassical effects and find that they include, remarkably, two-mode entanglement. The implications of our results for quantum cloning outside the Gaussian regime are also addressed.