Observation of Quantum Oscillations between a Josephson Phase Qubit and a Microscopic Resonator Using Fast Readout

K. B. Cooper, Matthias Steffen, R. McDermott, R. W. Simmonds, Seongshik Oh, D. A. Hite, D. P. Pappas, and John M. Martinis
Phys. Rev. Lett. 93, 180401 – Published 25 October 2004

Abstract

We have detected coherent quantum oscillations between Josephson phase qubits and critical-current fluctuators by implementing a new state readout technique that is an order of magnitude faster than previous methods. These results reveal a new aspect of the quantum behavior of Josephson junctions, and they demonstrate the means to measure two-qubit interactions in the time domain. The junction-fluctuator interaction also points to a possible mechanism for decoherence and reduced fidelity in superconducting qubits.

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  • Received 27 May 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.180401

©2004 American Physical Society

Authors & Affiliations

K. B. Cooper1, Matthias Steffen1,2, R. McDermott1, R. W. Simmonds1, Seongshik Oh1, D. A. Hite1, D. P. Pappas1, and John M. Martinis1,*

  • 1National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA
  • 2Center for Bits and Atoms, MIT, Cambridge, Massachusetts 02139, USA

  • *Electronic address: martinis@physics.ucsb.edu

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Vol. 93, Iss. 18 — 29 October 2004

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