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  Measuring the size of a quantum superposition of many-body states

Marquardt, F., Abel, B., & von Delft, J. (2008). Measuring the size of a quantum superposition of many-body states. Physical Review A, 78(1): 012109. doi:10.1103/PhysRevA.78.012109.

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 Creators:
Marquardt, Florian1, 2, Author              
Abel, Benjamin2, Author
von Delft, Jan2, Author
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1External Organizations, ou_persistent22              
2University of Munich, ou_persistent22              

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 Abstract: We propose a measure for the "size" of a quantum superposition of two many-body states with (supposedly) macroscopically distinct properties by counting how many single-particle operations are needed to map one state onto the other. This definition gives sensible results for simple, analytically tractable cases and is consistent with a previous definition restricted to Greenberger-Horne-Zeilinger-like states. We apply our measure to the experimentally relevant, nontrivial example of a superconducting three-junction flux qubit put into a superposition of left- and right-circulating supercurrent states, and we find the size of this superposition to be surprisingly small.

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Language(s): eng - English
 Dates: 2008-07
 Publication Status: Published in print
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 Identifiers: DOI: 10.1103/PhysRevA.78.012109
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Title: Physical Review A
  Other : Physical Review A: Atomic, Molecular, and Optical Physics
  Other : Phys. Rev. A
Source Genre: Journal
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Publ. Info: New York, NY : American Physical Society
Pages: - Volume / Issue: 78 (1) Sequence Number: 012109 Start / End Page: - Identifier: ISSN: 1050-2947
CoNE: https://pure.mpg.de/cone/journals/resource/954925225012_2