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Related Experiment Videos

RETRACTED: Real-time quantum feedback control of atomic spin-squeezing.

J M Geremia1, John K Stockton, Hideo Mabuchi

  • 1Physics and Control and Dynamical Systems, California Institute of Technology, Pasadena, CA 91125, USA. jgeremia@caltech.edu

Science (New York, N.Y.)
|April 10, 2004
PubMed
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Real-time feedback during quantum nondemolition measurements influenced measurement outcomes. This quantum control method harnesses measurement backaction to generate spin-squeezing and atomic entanglement, valuable for quantum information science.

Area of Science:

  • Quantum physics
  • Atomic physics
  • Quantum information science

Background:

  • Quantum nondemolition measurements are crucial for preserving quantum states.
  • Understanding and controlling measurement backaction is key for quantum technologies.

Purpose of the Study:

  • To demonstrate real-time feedback during quantum nondemolition measurements.
  • To show that measurement backaction can be harnessed for quantum control.
  • To generate spin-squeezing and atomic entanglement independent of measurement outcomes.

Main Methods:

  • Performing real-time feedback during quantum nondemolition measurements of atomic spin-angular momentum.
  • Utilizing measurement backaction as a form of actuation in quantum control.

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Main Results:

  • Successfully influenced the quantum statistics of measurement outcomes.
  • Demonstrated a feedback-mediated procedure to generate spin-squeezing.
  • Achieved reduction in quantum uncertainty and atomic entanglement not conditioned on measurement outcomes.

Conclusions:

  • Real-time feedback is a valuable tool for quantum control.
  • Harnessing measurement backaction enables new quantum information science applications.
  • The developed procedure offers a robust method for generating spin-squeezing and entanglement.