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Researchers developed a quantum mechanics-free subsystem using two micromechanical oscillators to bypass quantum back-action during oscillator measurement. This breakthrough enhances precision for detecting weak forces and generating nonclassical states.

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Area of Science:

  • Quantum mechanics
  • Quantum optics
  • Optomechanics

Background:

  • Quantum mechanics imposes fundamental limits on measurement precision.
  • Continuous measurement of an oscillator's position is subject to quantum back-action.
  • Detecting weak forces and generating nonclassical states are challenging due to these limits.

Purpose of the Study:

  • To demonstrate a method for measuring an oscillator while circumventing quantum back-action.
  • To realize a quantum mechanics-free subsystem using coupled micromechanical oscillators.
  • To verify the effectiveness of this subsystem in reducing measurement noise and confirming quantum entanglement.

Main Methods:

  • Constructing an effective oscillator from two coupled physical micromechanical oscillators.
  • Performing measurements of collective quadratures of the coupled system.
  • Quantifying quantum back-action evasion and entanglement using the Duan quantity.

Main Results:

  • Achieved quantum mechanics-free measurement by evading quantum back-action by 8 decibels on collective quadratures.
  • Obtained total noise within a factor of 2 of the full quantum limit.
  • Directly verified quantum entanglement between the two oscillators, with the Duan quantity 1.4 decibels below the separability bound.

Conclusions:

  • The developed quantum mechanics-free subsystem effectively reduces measurement back-action.
  • This technique facilitates enhanced detection of weak forces and generation/measurement of nonclassical motional states.
  • The verified quantum entanglement opens avenues for advanced quantum information processing and metrology.