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Measurement-based quantum control of mechanical motion.

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Researchers achieved measurement-based quantum control of a membrane resonator

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Area of Science:

  • Quantum mechanics
  • Optomechanics
  • Quantum control

Background:

  • Quantum system control is hindered by measurement backaction.
  • Efficient measurement balances information gain and disturbance.
  • Real-time feedback can mitigate backaction and control quantum states.

Purpose of the Study:

  • To demonstrate measurement-based quantum control for motional degrees of freedom.
  • To apply quantum control techniques to a millimetre-sized membrane resonator.

Main Methods:

  • Utilized an optomechanical transducer to measure resonator motion.
  • Achieved high measurement efficiency close to unity.
  • Employed an electronic feedback loop for real-time force application.

Main Results:

  • Cooled the membrane resonator to its quantum ground state (0.29 thermal occupation).
  • Achieved cooling nine decibels below the quantum-backaction limit.
  • Reduced thermal occupation by six orders of magnitude compared to the environment.

Conclusions:

  • Successfully demonstrated measurement-based quantum control of motion.
  • Extended quantum control to position and momentum degrees of freedom.
  • Opened possibilities for quantum information processing and gravitational-wave detection.