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  Dynamics of fluctuations in a quantum system

Chen, Y.-J., Pabst, S., Li, Z., Vendrell, O., & Santra, R. (2014). Dynamics of fluctuations in a quantum system. Physical Review A, 89(5): 052113. doi:10.1103/PhysRevA.89.052113.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-2405-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-2406-D
Genre: Journal Article

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PhysRevA.89.052113.pdf (Publisher version), 543KB
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2014
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http://dx.doi.org/10.1103/PhysRevA.89.052113 (Publisher version)
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 Creators:
Chen, Yi-Jen1, 2, 3, Author              
Pabst, Stefan2, Author
Li, Zheng1, 2, 3, Author              
Vendrell, Oriol2, Author
Santra, Robin2, 3, Author
Affiliations:
1International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266714              
2Center for Free-Electron Laser Science, DESY, Notkestrasse 85, 22607 Hamburg, Germany, ou_persistent22              
3Department of Physics, University of Hamburg, Jungiusstrasse 9, 20355 Hamburg, Germany, ou_persistent22              

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Free keywords: PACS numbers: 03.65.−w, 05.40.−a, 37.10.Vz, 45.50.−j
 Abstract: “The noise is the signal” [R. Landauer, Nature (London) 392, 658 (1998)] emphasizes the rich information content encoded in fluctuations. This paper assesses the dynamical role of fluctuations of a quantum system driven far from equilibrium, with laser-aligned molecules as a physical realization. Time evolutions of the expectation value and the uncertainty of a standard observable are computed quantum mechanically and classically. We demonstrate the intricate dynamics of the uncertainty that are strikingly independent of those of the expectation value, and their exceptional sensitivity to quantum properties of the system. In general, detecting the time evolution of the fluctuations of a given observable provides information on the dynamics of correlations in a quantum system.

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Language(s): eng - English
 Dates: 2014-03-162014-05-142014-05
 Publication Status: Published in print
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevA.89.052113
 Degree: -

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Title: Physical Review A
  Other : Phys. Rev. A
  Other : Physical Review A: Atomic, Molecular, and Optical Physics
Source Genre: Journal
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Publ. Info: New York, NY : American Physical Society
Pages: - Volume / Issue: 89 (5) Sequence Number: 052113 Start / End Page: - Identifier: ISSN: 1050-2947
CoNE: /journals/resource/954925225012_2