Near-perfect simultaneous measurement of a qubit register

  • Authors:

  • M Acton;K.-A. Brickman;P. C. Haljan;P. J. Lee;L. Deslauriers;C. Monroe

  • Affiliations:

  • FOCUS Center and Department of Physics, University of Michigan, Ann Arbor, MI;FOCUS Center and Department of Physics, University of Michigan, Ann Arbor, MI;Department of Physics, Simon Fraser University, Burnaby, Canada and FOCUS Center and Department of Physics, University of Michigan, Ann Arbor, MI;National Institute of Standards and Technology, Gaithersburg, Maryland and FOCUS Center and Department of Physics, University of Michigan, Ann Arbor, MI;Department of Physics, Stanford University, Palo Alto, California and FOCUS Center and Department of Physics, University of Michigan, Ann Arbor, MI;FOCUS Center and Department of Physics, University of Michigan, Ann Arbor, MI

  • Venue:
  • Quantum Information & Computation
  • Year:
  • 2006

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Abstract

Simultaneous measurement of multiple qubits stored in hyperfine levels of trapped 111Cd+ ions is realized with an intensified charge-coupled device (CCD) imager. A general theory of fluorescence detection for hyperfine qubits is presented and applied to experimental data. The use of an imager for photon detection allows for multiple qubit state measurement with detection fidelities of greater than 98%. Improvements in readout speed and fidelity are discussed in the context of scalable quantum computation architectures.