Nonclassicality of noisy quantum states

Abstract

Nonclassicality conditions for an oscillator-like system interacting with a hot thermal bath are considered. Nonclassical properties of quantum states can be conserved up to a certain temperature threshold only. In this case, affection of the thermal noise can be compensated via transformation of an observable, which tests the nonclassicality (witness function). Possibilities for experimental implementations based on unbalanced homodyning are discussed. At the same time, we demonstrate that the scheme based on balanced homodyning cannot be improved for noisy states with proposed technique and should be applied directly.

15 pages, 3 figures

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• Relating the Entanglement and Optical Nonclassicality of Multimode States of a Bosonic Quantum Field
• Quadrature coherence scale driven fast decoherence of bosonic quantum field states
• Decoherence and nonclassicality of photon-added/subtracted multi-mode Gaussian states
• Quantum speed limit and nonclassicality in open quantum system models using the Wigner function