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Quantum Computing in Solid State Systems pp 28–37Cite as

The Josephson Bifurcation Amplifier for Quantum Measurements

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Abstract

A new type of amplifier whose primary purpose is the readout of superconducting quantum bits is constructed. It is based on the transition of an RF-driven Josephson junction between two distinct oscillation states near a dynamical bifurcation point. The main advantages of this new amplifier are speed, high-sensitivity, low back-action, and the absence of on-chip dissipation. Using pulsed microwave techniques, bifurcation amplification in nanofabricated Al junctions is demonstrated and the performance predicted by theory is verified.

Keywords

  • Quantum Measurement
  • Signal Phase
  • Oscillation State
  • Escape Rate
  • Dynamical Switching

These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Author information

Authors and Affiliations

  1. Departments of Applied Physics and Physics, Yale University, USA

    I. Siddiqi, R. Vijay, F. Pierre, C. M. Wilson, L. Frunzio, M. Metcalfe, C. Rigetti & M. H. Devoret

Authors
  1. I. Siddiqi
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  2. R. Vijay
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  3. F. Pierre
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  4. C. M. Wilson
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  5. L. Frunzio
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  6. M. Metcalfe
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  7. C. Rigetti
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  8. M. H. Devoret
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Editor information

Editors and Affiliations

  1. Istituto di Cibernetica “E. Caianiello” CNR, Italy

    B. Ruggiero & C. Granata & 

  2. Chalmers University of Technology, Sweden

    P. Delsing

  3. RIKEN/NEC, Tsukuba, Japan

    Y. Pashkin

  4. Seconda Università di Napoli, Italy

    P. Silvestrini

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Siddiqi, I. et al. (2006). The Josephson Bifurcation Amplifier for Quantum Measurements. In: Ruggiero, B., Delsing, P., Granata, C., Pashkin, Y., Silvestrini, P. (eds) Quantum Computing in Solid State Systems. Springer, New York, NY. https://doi.org/10.1007/0-387-31143-2_4

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