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Quantum state control, entanglement, and readout of the Josephson persistent-current qubit

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Abstract

Quantum state control including entanglement, and readout of the Josephson persistent-current qubit, flux qubit, are reviewed. First, we mention our single-shot readout of quantum superposition state of a flux qubit by a current biased dc-SQUID. Second, we mention entangled state and vacuum Rabi oscillations of a flux-qubit LC-resonator system where qubit-resonator coupled state are controlled by a combination of microwave and DC-shift pulses, resulting in a controlling and measuring sequence analogous to atomic cavity QED. Third, we report our recent progress in high fidelity readout of a flux qubit state via Josephson bifurcation amplifier (JBA).

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Authors and Affiliations

  1. NTT Basic Research Laboratories, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa, 243-0198, Japan

    K. Semba, K. Kakuyanagi, H. Nakano, S. Saito & H. Tanaka

  2. D-Wave Systems Inc.,, 100 - 4401 Still Creek Drive, Burnaby, BC, V5C 6G9, Canada

    J. Johansson

  3. Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan

    H. Takayanagi

Authors
  1. K. Semba
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  2. J. Johansson
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  3. K. Kakuyanagi
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  4. H. Nakano
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  5. S. Saito
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  6. H. Tanaka
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  7. H. Takayanagi
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Correspondence to K. Semba.

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Semba, K., Johansson, J., Kakuyanagi, K. et al. Quantum state control, entanglement, and readout of the Josephson persistent-current qubit. Quantum Inf Process 8, 199–215 (2009). https://doi.org/10.1007/s11128-009-0098-9

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  • DOI: https://doi.org/10.1007/s11128-009-0098-9

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