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Researchers conducted the most macroscopic quantum test using a mechanical resonator, ruling out classical physics for microgram-scale systems. This study measured the Wigner function, demonstrating quantum mechanics at an unprecedented scale.

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Area of Science:

  • Quantum mechanics
  • Solid-state physics
  • Macroscopic quantum phenomena

Background:

  • Solid-state mechanical resonators are emerging platforms for observing nonclassical behavior in macroscopic systems.
  • Previous experiments have explored quantum phenomena in increasingly large systems.

Purpose of the Study:

  • To perform the most macroscopic quantum test to date in a mechanical resonator.
  • To probe the validity of quantum mechanics by excluding classical descriptions at the microgram mass scale.

Main Methods:

  • Direct measurement of the Wigner function of a high-overtone bulk acoustic wave resonator mode.
  • Monitoring the decay of Wigner function negativities over tens of microseconds.

Main Results:

  • Successfully performed a quantum test on a microgram-scale mechanical resonator.
  • Achieved a macroscopicity value of μ=11.3, comparable to state-of-the-art atom interferometers.
  • Observed the gradual decay of Wigner function negativities, indicating quantum behavior.

Conclusions:

  • The study provides strong evidence for quantum mechanics at the microgram mass scale.
  • Future work can enhance mode geometry and coherence times to test quantum superposition at larger scales.
  • This research can place more stringent bounds on spontaneous collapse models.