Two-Qubit State Tomography Using a Joint Dispersive Readout

S. Filipp, P. Maurer, P. J. Leek, M. Baur, R. Bianchetti, J. M. Fink, M. Göppl, L. Steffen, J. M. Gambetta, A. Blais, and A. Wallraff
Phys. Rev. Lett. 102, 200402 – Published 22 May 2009

Abstract

Quantum state tomography is an important tool in quantum information science for complete characterization of multiqubit states and their correlations. Here we report a method to perform a joint simultaneous readout of two superconducting qubits dispersively coupled to the same mode of a microwave transmission line resonator. The nonlinear dependence of the resonator transmission on the qubit state dependent cavity frequency allows us to extract the full two-qubit correlations without the need for single-shot readout of individual qubits. We employ standard tomographic techniques to reconstruct the density matrix of two-qubit quantum states.

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  • Received 17 December 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.200402

©2009 American Physical Society

Authors & Affiliations

S. Filipp1,*, P. Maurer1, P. J. Leek1, M. Baur1, R. Bianchetti1, J. M. Fink1, M. Göppl1, L. Steffen1, J. M. Gambetta2, A. Blais3, and A. Wallraff1

  • 1Department of Physics, ETH Zurich, CH-8093 Zurich, Switzerland
  • 2Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
  • 3Département de Physique, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada

  • *filipp@phys.ethz.ch

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Vol. 102, Iss. 20 — 22 May 2009

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