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Unconditional quantum-noise suppression via measurement-based quantum feedback.

Ryotaro Inoue1, Shin-Ichi-Ro Tanaka, Ryo Namiki

  • 1Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.

Physical Review Letters
|May 18, 2013
PubMed
Summary

Researchers achieved unconditional quantum-noise suppression in atomic systems using feedback control. This method reduces noise in collective spin measurements, enhancing precision in quantum technologies.

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Area of Science:

  • Quantum physics
  • Atomic physics
  • Quantum optics

Background:

  • Quantum measurements are inherently limited by noise.
  • Collective spin systems offer enhanced sensitivity for quantum measurements.
  • Quantum nondemolition (QND) measurements allow repeated measurements without disturbing the quantum state.

Purpose of the Study:

  • To demonstrate unconditional quantum-noise suppression in a collective spin system.
  • To utilize feedback control based on QND measurements for noise reduction.
  • To convert conditional noise suppression into an unconditional form.

Main Methods:

  • Performing shot-noise limited collective spin measurements on laser-cooled ytterbium-171 atoms.
  • Employing quantum nondemolition measurement techniques.

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  • Implementing a feedback control loop based on measurement results.

    • Main Results:

    • Achieved -0.80 dB quantum-noise suppression in a conditional manner.
    • Demonstrated successful conversion of conditional to unconditional noise suppression.
    • Maintained a high level of noise reduction without significant loss.

    Conclusions:

    • Unconditional quantum-noise suppression is achievable in collective spin systems.
    • Feedback control combined with QND measurements is effective for noise reduction.
    • This technique has potential applications in precision quantum measurements and sensing.