Nonclassicality of noisy quantum states

2005/12/31 by A. A. Semenov, A A Semenov, D. Yu. Vasylyev +3
Computer Science · Physics and Astronomy · #Mechanical and Optical Resonators #Quantum Information and Cryptography #Quantum chaos and dynamical systems #quant-ph

paper · pdf · doi:10.1088/0953-4075/39/4/014

published as J. Phys. B: At. Mol. Opt. Phys. 39 (2006) 905-916 · 15 pages, 3 figures

openalex publication_date 2006/01/23 · arxiv created 2006/02/03 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30

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 the proposed technique and should be applied directly.

Citations

• Can Quantum-Mechanical Description of Physical Reality Be Considered Complete?
• Ordered Expansions in Boson Amplitude Operators
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