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

Quantum dynamics of superconducting nano-circuits: phase qubit, charge qubit and rhombi chains 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantum Information Processing Springer Journals

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

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Publisher
Springer Journals
Copyright
Copyright © 2009 by Springer Science+Business Media, LLC
Subject
Physics; Quantum Information Technology, Spintronics; Quantum Computing; Data Structures, Cryptology and Information Theory; Quantum Physics; Mathematical Physics
ISSN
1570-0755
eISSN
1573-1332
D.O.I.
10.1007/s11128-009-0094-0
Publisher site
See Article on Publisher Site

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.

Journal

Quantum Information ProcessingSpringer Journals

Published: Mar 4, 2009

References

  • Strong-field effects in the Rabi oscillations of the superconducting phase qubit
    Strauch, F.W.; Dutta, S.K.; Paik, H.; Palomaki, T.A.; Mitra, K.; Cooper, B.K.; Lewis, R.M.; Anderson, J.R.; Dragt, A.J.; Lobb, C.J.; Wellstood, F.C.
  • dc SQUID : noise and optimization
    Tesche, C.D.; Clarke, J.J.
  • The thermocoax cable as the microwave frequency filter for single electron circuits
    Zorin, A.B.

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