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Quantum dynamics of superconducting nano-circuits: phase qubit, charge qubit and rhombi chains

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Abstract

We have studied different quantum dynamics of superconducting nano-circuits with Josephson junctions. A dc SQUID, when it is strongly decoupled from the environment, demonstrates two-level and multilevel dynamics. We have realized a two qubits coupled circuit based on a dc SQUID in parallel with an asymmetric Cooper pair transistor (ACPT). The ACPT behaves as a charge qubit. Its asymmetry produces a strong tunable coupling with the dc SQUID which is used to realize entangled states between the two qubits and new read-out of the charge qubit based on adiabatic quantum transfer. We have measured the current–phase relations of different rhombi chains in the presence or absence of quantum fluctuations which confirm theoretical predictions.

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Authors and Affiliations

  1. Institut Néel, C.N.R.S. and Université Joseph Fourier, BP 166, 38042, Grenoble Cedex 9, France

    O. Buisson, W. Guichard, L. Lévy, B. Pannetier, A. Fay, E. Hoskinson, F. Lecocq, Z. H. Peng & I. M. Pop

  2. LPMMC, C.N.R.S. and Université Joseph Fourier, BP 166, 38042, Grenoble Cedex 9, France

    F. W. J. Hekking & N. Didier

  3. Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116, Braunschweig, Germany

    R. Dolata & A. B. Zorin

Authors
  1. O. Buisson
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  2. W. Guichard
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  3. F. W. J. Hekking
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  4. L. Lévy
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  5. B. Pannetier
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  6. R. Dolata
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  11. F. Lecocq
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Correspondence to O. Buisson.

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Buisson, O., Guichard, W., Hekking, F.W.J. et al. Quantum dynamics of superconducting nano-circuits: phase qubit, charge qubit and rhombi chains. Quantum Inf Process 8, 155–182 (2009). https://doi.org/10.1007/s11128-009-0094-0

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