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Researchers generated path-entangled microwave radiation from a silicon nanostring oscillator. This breakthrough demonstrates quantum correlations in mechanical systems, crucial for quantum-enhanced detection and sensing applications.

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Area of Science:

  • Quantum mechanics
  • Mechanical systems
  • Microwave technology

Background:

  • Entanglement is key for quantum devices.
  • Einstein-Podolsky-Rosen (EPR) states are used in quantum communication.
  • Generating EPR states typically involves optical or Josephson circuits.

Purpose of the Study:

  • To deterministically generate and distribute entangled states with a mechanical oscillator.
  • To achieve a balance between excitation, cooling, and dissipation in an ultralow noise environment.

Main Methods:

  • Parametric driving of a 30-micrometre-long silicon nanostring oscillator.
  • Observation of stationary emission of path-entangled microwave radiation.
  • Squeezing joint field operators of two thermal modes below the vacuum level.

Main Results:

  • Stationary emission of path-entangled microwave radiation observed.
  • Joint field operators squeezed by 3.40 decibels below vacuum.
  • Mechanical oscillator motion correlates up to 50 photons per second per hertz, showing quantum discord robust to microwave noise.

Conclusions:

  • Demonstrated non-classical nature of a mechanical oscillator via non-invasive measurement.
  • Potential implications for quantum-enhanced detection, sensing, and fundamental physics.
  • On-chip devices could entangle subsystems across different energy scales in the future.