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Fabrication and Testing of Microfluidic Optomechanical Oscillators
Published on: May 29, 2014
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Measuring High-Order Phonon Correlations in an Optomechanical Resonator
Y S S Patil1, J Yu2, S Frazier1
1Department of Physics, Yale University, New Haven, Connecticut 06520, USA.
Physical Review Letters
|May 20, 2022
Summary
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.
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.
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