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Träfflista för sökning "WFRF:(Gambetta J.M.) "

Sökning: WFRF:(Gambetta J.M.)

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1.
  • Chow, J.M., et al. (författare)
  • Randomized benchmarking and process tomography for gate errors in a solid-state qubit
  • 2009
  • Ingår i: Physical Review Letters. - 1079-7114 .- 0031-9007. ; 102:9
  • Tidskriftsartikel (refereegranskat)abstract
    • We present measurements of single-qubit gate errors for a superconducting qubit. Results from quantum process tomography and randomized benchmarking are compared with gate errors obtained from a double pulse experiment. Randomized benchmarking reveals a minimum average gate error of 1.1±0.3% and a simple exponential dependence of fidelity on the number of gates. It shows that the limits on gate fidelity are primarily imposed by qubit decoherence, in agreement with theory.
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2.
  • Bishop, Lev S., et al. (författare)
  • Proposal for generating and detecting multi-qubit GHZ states in circuit QED
  • 2009
  • Ingår i: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 11, s. 073040-
  • Tidskriftsartikel (refereegranskat)abstract
    • We propose methods for the preparation and entanglement detectionof multi-qubit Greenberger–Horne–Zeilinger (GHZ) states in circuit quantumelectrodynamics. Using quantum trajectory simulations appropriate for thesituation of a weak continuous measurement, we show that the joint dispersivereadout of several qubits can be utilized for the probabilistic production ofhigh-fidelity GHZ states. When employing a nonlinear filter on the recordedhomodyne signal, the selected states are found to exhibit values of theBell–Mermin operator exceeding 2 under realistic conditions. We discuss thepotential of the dispersive readout to demonstrate a violation of the Merminbound, and present a measurement scheme avoiding the necessity for fulldetector tomography.
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