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Parallel Low-Loss Measurement of Multiple Atomic Qubits.

Minho Kwon1, Matthew F Ebert1, Thad G Walker1

  • 1Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, Wisconsin 53706, USA.

Physical Review Letters
|December 9, 2017
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Summary
This summary is machine-generated.

We achieved high-fidelity measurement of rubidium atom hyperfine states using state-dependent fluorescence in a dipole trap. This method minimally perturbs the atoms, preserving their quantum states with high probability.

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Area of Science:

  • Atomic physics
  • Quantum optics
  • Quantum information science

Background:

  • Precise measurement of atomic states is crucial for quantum technologies.
  • Previous methods often suffered from atom loss or state decoherence.

Purpose of the Study:

  • To demonstrate a low-loss method for measuring the hyperfine ground state of rubidium atoms.
  • To achieve high state detection fidelity with minimal perturbation to the atoms.

Main Methods:

  • Utilized state-dependent fluorescence detection in a five-site dipole trap array.
  • Employed circularly polarized probe light and a controlled quantization axis to minimize atom alteration.
  • Implemented corrections for imperfect state preparation and background losses.

Main Results:

  • Achieved a mean state detection fidelity of 97% (uncorrected) and 98.7% (corrected).
  • Minimized atom loss during state measurement to less than 2%.
  • Preserved the initial hyperfine state with a probability greater than 98%.

Conclusions:

  • The demonstrated method offers a highly accurate and low-loss approach for hyperfine state measurement.
  • This technique is suitable for applications in quantum computing and precision measurements.