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  Qubit state detection using the quantum Duffing oscillator

Leyton, V., Thorwart, M., & Peano, V. (2011). Qubit state detection using the quantum Duffing oscillator. Physical Review B, 84(13). doi:10.1103/PhysRevB.84.134501.

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 Creators:
Leyton, Vicente1, Author
Thorwart, Michael1, Author
Peano, Vittorio2, 3, Author           
Affiliations:
1Universität Hamburg, Institut für Theoretische Physik, Jungiusstraße 9, 20355 Hamburg, Germany , ou_persistent22              
2External Organizations, ou_persistent22              
3Michigan State University, Department of Physics and Astronomy, East Lansing, Michigan 48824, USA, ou_persistent22              

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 Abstract: We introduce a detection scheme for the state of a qubit that is based on resonant few-photon transitions in a driven nonlinear resonator. The latter is parametrically coupled to the qubit and is used as its detector. Close to the fundamental resonator frequency, the nonlinear resonator shows sharp resonant few-photon transitions. Depending on the qubit state, these few-photon resonances are shifted to different driving frequencies. We show that this detection scheme offers the advantage of small back action, a large discrimination power with an enhanced readout fidelity, and a sufficiently large measurement efficiency. A realization of this scheme in the form of a persistent current qubit inductively coupled to a driven SQUID detector in its nonlinear regime is discussed.

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Language(s): eng - English
 Dates: 2011-10-03
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevB.84.134501
 Degree: -

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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 84 (13) Sequence Number: - Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008