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Measuring High-Order Phonon Correlations in an Optomechanical Resonator.

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This summary is machine-generated.

Researchers measured the motional state of a superfluid helium-4 resonator using single photon detectors. The findings confirm predictions of thermal equilibrium and Markovian coupling in the acoustic mode.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Superfluidity

Background:

  • Superfluid helium-4 (⁴He) is a quantum fluid with unique properties.
  • Probing the motional state of micro- and nano-mechanical resonators is crucial for quantum technologies.
  • Understanding quantum dissipation mechanisms is essential for developing sensitive quantum devices.

Purpose of the Study:

  • To investigate the motional state of a superfluid ⁴He resonator using single photon detection.
  • To measure phonon coherences in the resonator and compare them with theoretical predictions.
  • To analyze the coupling mechanism between the resonator's acoustic mode and its environment.

Main Methods:

  • Utilized single photon detectors to monitor scattered photons from a superfluid ⁴He resonator.
  • Analyzed arrival times of Stokes and anti-Stokes photons to determine phonon coherences.
  • Employed postselection on photon detection events to measure resonator coherences with specific phonon numbers.
  • Modeled the system assuming thermal equilibrium and Markovian coupling to an external bath.

Main Results:

  • Measured phonon coherences of the superfluid ⁴He resonator up to the fourth order.
  • Quantified resonator coherences for specific phonon addition/subtraction states (≤3 phonons).
  • Observed consistency between experimental measurements and theoretical predictions.

Conclusions:

  • The motional state of the superfluid ⁴He resonator is accurately probed using single photon detection.
  • Experimental results support the theoretical model of thermal equilibrium and Markovian coupling.
  • This work demonstrates a novel method for characterizing quantum states in superfluid systems.