Optimal estimation of a classical force with a damped oscillator in the non-Markovian bath

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• 作者：Yang Gao (1)
  Hwang Lee (2)
  Yong Lei Jia (1)
  
  1. Department of Physics ; Xinyang Normal University ; Xinyang ; Henan ; 464000 ; P.R. China
  2. Hearne Institute for Theoretical Physics and Department of Physics and Astronomy ; Louisiana State University ; Baton Rouge ; 70803 ; LA ; USA
  
• 关键词：Quantum Optics
• 刊名：The European Physical Journal D - Atomic, Molecular and Optical Physics
• 出版年：2014
• 出版时间：October 2014
• 年：2014
• 卷：68
• 期：10
• 全文大小：278 KB
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Atoms, Molecules, Clusters and Plasmas
  Nanotechnology
  Quantum Physics
  Quantum Computing, Information and Physics
  Complexity
  Solid State Physics and Spectroscopy
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1434-6079

文摘

We derive the optimal quantum limit of probing a classical force by a damped harmonic oscillator initially prepared in the factorized squeezed state. The memory effects of the thermal bath on the oscillator evolution are investigated. We show that the optimal force sensitivity obtained by the quantum estimation theory approaches to zero for the non-Markovian bath, whereas approaches to a finite non-zero value for the Markovian bath as the mean energy of the oscillator goes to infinity.