Nonlinearity and nonclassicality in a nanomechanical resonator

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• 作者：Berihu Teklu ; Alessandro Ferraro ; Mauro Paternostro…
• 关键词：nanomechanics ; nonclassicality ; nonlinearity
• 刊名：EPJ Quantum Technology
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：2
• 期：1
• 全文大小：1802KB
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• 作者单位：Berihu Teklu (1) (2)
  Alessandro Ferraro (3)
  Mauro Paternostro (3)
  Matteo G A Paris (2)
  
  1. PHOTON-N2, Institut Pascal, Clermont Universit茅, Blaise Pascal University, CNRS, Aubi猫re Cedex, F-63177, France
  2. Dipartimento di Fisica, Universit脿 degli Studi di Milano, Milano, I-20133, Italia
  3. Centre for Theoretical Atomic, Molecular, and Optical Physics, School of Mathematics and Physics, Queen鈥檚 University, Belfast, BT7 1NN, UK
  
• 刊物类别：Quantum Physics; Quantum Information Technology, Spintronics; Nanotechnology and Microengineering;
• 刊物主题：Quantum Physics; Quantum Information Technology, Spintronics; Nanotechnology and Microengineering;
• 出版者：Springer Berlin Heidelberg
• ISSN：2196-0763

文摘

We address quantitatively the relationship between the nonlinearity of a mechanical resonator and the nonclassicality of its ground state. In particular, we analyze the nonclassical properties of the nonlinear Duffing oscillator (being driven or not) as a paradigmatic example of a nonlinear nanomechanical resonator. We first discuss how to quantify the nonlinearity of this system and then show that the nonclassicality of the ground state, as measured by the volume occupied by the negative part of the Wigner function, monotonically increases with the nonlinearity in all the working regimes addressed in our study. Our results show quantitatively that nonlinearity is a resource to create nonclassical states in mechanical systems. Keywords nanomechanics nonclassicality nonlinearity