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A two-mode thermomechanically squeezed phonon laser.

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Researchers developed a novel phonon laser that generates bright, coherent, and classically correlated phonons. This breakthrough enables simultaneous lasing and two-mode squeezing, advancing quantum mechanics and mesoscopic thermodynamics.

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Area of Science:

  • Quantum optics
  • Mesoscopic thermodynamics
  • Nonlinear physics

Background:

  • Lasers are crucial in physics but lack inherent squeezing and entanglement.
  • Generating these quantum properties typically requires nonlinear media, which are often weak in the electromagnetic domain, leading to dim sources.
  • Strong nonlinearities are challenging to implement in optical systems for bright quantum sources.

Purpose of the Study:

  • To develop a bright and coherent source of quantum-correlated phonons.
  • To enable simultaneous lasing and two-mode squeezing in a mechanical system.
  • To explore strong nonlinearities in mechanical systems for quantum applications.

Main Methods:

  • Implemented a two-mode thermomechanical squeezed phonon laser.
  • Combined nonlinear damping with parametric modulation of coupled mechanical modes in an optically levitated nanoparticle.
  • Operated the system above the linear stability threshold.

Main Results:

  • Achieved simultaneous lasing and subthermal two-mode squeezing.
  • Generated parametrically sustained oscillations.
  • Produced a bright and coherent source of classically correlated phonons.

Conclusions:

  • The developed phonon laser is a significant advancement for optical tweezer physics.
  • It serves as a stepping stone for developing quantum mechanical extensions.
  • The device is relevant for studying nonequilibrium systems in mesoscopic classical thermodynamics.