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Characterization of an entangled system of two superconducting qubits using a multiplexed capacitance measurement

M. D. Shaw, J. F. Schneiderman, J. Bueno, B. S. Palmer, P. Delsing, and P. M. Echternach
Phys. Rev. B 79, 014516 – Published 23 January 2009

Abstract

We characterize a pair of Cooper-pair boxes coupled with a fixed capacitor using spectroscopy and measurements of the ground-state quantum capacitance. We use the extracted parameters to estimate the concurrence or degree of entanglement between the two qubits. We also present a thorough demonstration of a multiplexed quantum capacitance measurement technique, which is in principle scalable to a large array of superconducting qubits.

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  • Received 16 September 2008

DOI:https://doi.org/10.1103/PhysRevB.79.014516

©2009 American Physical Society

Authors & Affiliations

M. D. Shaw1, J. F. Schneiderman1,2, J. Bueno3, B. S. Palmer4, P. Delsing2,3, and P. M. Echternach1,3

  • 1Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089, USA
  • 2Microtechnology and Nanoscience, MC2, Chalmers University of Technology, 412 96 Göteborg, Sweden
  • 3Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA
  • 4Laboratory for Physical Sciences, College Park, Maryland 20740, USA

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Issue

Vol. 79, Iss. 1 — 1 January 2009

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